SOLUTIONS TO MATH38181 EXTREME VALUES AND FINANCIAL RISK EXAM
|
|
- Οὐρανός Ζάρκος
- 5 χρόνια πριν
- Προβολές:
Transcript
1 SOLUTIONS TO MATH38181 EXTREME VALUES AND FINANCIAL RISK EXAM
2 Solutions to Question 1 a) The cumulative distribution function of T conditional on N n is Pr (T t N n) Pr (max (X 1,..., X N ) t N n) Pr (max (X 1,..., X n ) t N n) Pr (X 1 t,..., X n t) Pr (X 1 t) Pr (X n t) [1 + ex( t)] 1 [1 + ex( t)] 1 [1 + ex( t)] n. b) The unconditional cumulative distribution function of T is Pr(T t) Pr (T t N n) θ(1 θ) n 1 n1 [1 + ex( t)] n θ(1 θ) n 1 n1 θ [1 + ex( t)] 1 [1 + ex( t)] 1 n (1 θ) n 1 n1 θ [1 + ex( t)] 1 { 1 [1 + ex( t)] 1 (1 θ) } 1 θ θ + ex( t). c) The unconditional robability density function of T is f T (t) θ ex( t) [θ + ex( t)] 2. (1 marks) 1
3 d) The moment generating function of T is M T (s) where we have set y θ θ ex(st t) [θ + ex( t)] 2 dt ex(st t) [θ + ex( t)] 2 dt 1 ( 1 θ s y 1+s (1 y) 1 s 1 y 1 ) dy y [ 1 1 ] θ s y 1+s (1 y) s dy y s (1 y) 1 s dy θ s [B(2 + s, 1 s) B(1 + s, 2 s)], θ θ+ex( t) and used the definition of the beta function. e) Setting θ θ + ex( t) and solving for t, we obtain value at risk of T as [ VaR (T ) log θ 1 ]. (3 marks) f) The exected shortfall T is ES (T ) 1 [ log θ log(1 u) + log u] du log θ 1 log(1 u)du + 1 log udu log θ 1 } {[u log(1 u)] + u 1 u du + 1 {[u log u] log θ 1 { } u log(1 ) + 1 u du + 1 { log } log θ 1 { log(1 ) log(1 )} + log 1 log θ + log 1 log(1 ) +. 2 } 1du
4 3
5 Solutions to Question 2 If there are norming constants a n >, b n and a nondegenerate G such that the cdf of a normalized version of M n converges to G, i.e. ( ) Mn b n Pr x F n (a n x + b n ) G(x) (1) a n as n then G must be of the same tye as (cdfs G and G are of the same tye if G (x) G(ax + b) for some a >, b and all x) as one of the following three classes: I : Λ(x) ex { ex( x)}, x R; { if x <, II : Φ α (x) ex { x α } if x for some α > ; { ex { ( x) III : Ψ α (x) α } if x <, 1 if x for some α >. SEEN The necessary and sufficient conditions for the three extreme value distributions are: 1 F (t + xγ(t)) I : γ(t) > s.t. t w(f ) 1 F (t) II : w(f ) and t 1 F (tx) 1 F (t) x α, x >, ex( x), x R, III : w(f ) < and t 1 F (w(f ) tx) 1 F (w(f ) t) xα, x >. SEEN First, suose that G belongs to the max domain of attraction of the Gumbel extreme value distribution. Then, there must exist a strictly ositive function say h(t) such that 1 G (t + xh(t)) t w(g) 1 G(t) e x 4
6 for every x >. But 1 F (t + xh(t)) t w(f ) 1 F (t) t w(f ) t w(g) t w(g) ( 1 + xh (t) ) f (t + xh(t)) f(t) ( 1 + xh (t) ) { g (t + xh(t)) [1 G (t + xh(t))] λb 1 1 [1 G (t + xh(t))] λ ( 1 + xh (t) ) g (t + xh(t)) g(t) 1 G (t + xh(t)) t w(g) 1 G(t) g (t) [1 G (t)] λb 1 { 1 [1 G (t)] λ [ ] λb 1 1 G (t + xh(t)) {1 [1 G (t + xh(t))] λ 1 G (t) 1 [1 G (t)] λ [ ] } λb 1 1 G (t + xh(t)) {1 [1 G (t + xh(t))] λ a 1 1 G (t) [ ] λb 1 G (t + xh(t)) {1 [1 G (t + xh(t))] λ t w(g) 1 G (t) 1 [1 G (t)] λ [ ] λb { 1 G (t + xh(t)) 1 [1 λg (t + xh(t))] t w(g) 1 G (t) 1 [1 λg (t)] [ ] λb { 1 G (t + xh(t)) G (t + xh(t)) t w(g) 1 G (t) G (t) [ ] λb 1 G (t + xh(t)) t w(g) 1 G (t) ex( λbx) 1 [1 G (t)] λ for every x >, assuming w(f ) w(g). So, it follows that F also belongs to the max domain of attraction of the Gumbel extreme value distribution with ( ) P Mn b n x ex [ ex( λbx)] n for some suitable norming constants a n > and b n. a n Second, suose that G belongs to the max domain of attraction of the Fréchet extreme value distribution. Then, there must exist a β > such that 1 G (tx) t 1 G(t) x β 5
7 for every x >. But 1 F (tx) t 1 F (t) xf (tx) t f(t) { λb 1 xg (tx) [1 G (tx)] 1 [1 G (tx)] λ { t g (t) [1 G (t)] λb 1 1 [1 G (t)] λ t xg (tx) g(t) t 1 G (tx) 1 G(t) [ 1 G (tx) 1 G (t) [ 1 G (tx) 1 G (t) ] λb 1 {1 [1 G (tx)] λ [ ] λb 1 G (tx) {1 [1 G (tx)] λ t 1 G (t) 1 [1 G (t)] λ [ ] λb { 1 G (tx) 1 [1 λg (tx)] t 1 G (t) 1 [1 λg (t)] [ ] λb { 1 G (tx) G (tx) t 1 G (t) G (t) t x λbβ [ 1 G (tx) 1 G (t) ] λb 1 [1 G (t)] λ ] λb 1 {1 [1 G (tx)] λ 1 [1 G (t)] λ for every x >. So, it follows that F also belongs to the max domain of attraction of the Fréchet extreme value distribution with ( ) P Mn b n x ex ( x λbβ) n for some suitable norming constants a n > and b n. a n Third, suose that G belongs to the max domain of attraction of the Weibull extreme value distribution. Then, there must exist a β > such that 1 G (w(g) tx) t 1 G (w(g) t) xβ 6
8 for every x >. 1 F (w(f ) tx) t 1 F (w(f ) t) xf (w(f ) tx) t f (w(f ) t) { λb 1 xg (w(f ) tx) [1 G (w(f ) tx)] 1 [1 G (w(f ) tx)] λ { t g (w(f ) t) [1 G (w(f ) t)] λb 1 1 [1 G (w(f ) t)] λ t xg (w(f ) tx) g (w(f ) t) t 1 G (w(f ) tx) 1 G (w(f ) t) t t t t x λbβ [ 1 G (w(f ) tx) 1 G (w(f ) t) [ 1 G (w(f ) tx) 1 G (w(f ) t) [ ] λb 1 G (w(f ) tx) {1 [1 G (w(f ) tx)] λ 1 G (w(f ) t) 1 [1 G (w(f ) t)] λ [ ] λb { 1 G (w(f ) tx) 1 [1 λg (w(f ) tx)] 1 G (w(f ) t) 1 [1 λg (w(f ) t)] [ ] λb { 1 G (w(f ) tx) G (w(f ) tx) 1 G (w(f ) t) [ 1 G (w(f ) tx) 1 G (w(f ) t) ] λb G (w(f ) t) ] λb 1 {1 [1 G (w(f ) tx)] λ 1 [1 G (w(f ) t)] λ ] λb 1 {1 [1 G (w(f ) tx)] λ 1 [1 G (w(f ) t)] λ for every x <, assuming w(f ) w(g). So, it follows that F also belongs to the max domain of attraction of the Weibull extreme value distribution with ( ) P Mn b n x ex ( ( x) λbβ) n for some suitable norming constants a n > and b n. a n 7
9 Solutions to Question 3 a) Note that w(f ) n and Pr (X w(f )) 1 F (w(f ) 1) Pr (X n) 1 F (n 1) Pr (X n) 1 Pr (X 1) Pr (X 2) Pr (X n 1) Pr (X n) Pr (X n) 1. Hence, there can be no non-degenerate it. b) Note that w(f ) min(n, K) and Pr (X w(f )) 1 F (w(f ) 1) Pr (X min(n, K)) 1 F (min(n, K) 1) Pr (X min(n, K)) 1 Pr (X max(, n + K N)) Pr (X max(, n + K N) + 1) Pr (X min(n, K) 1 Pr (X min(n, K)) Pr (X min(n, K)) 1. Hence, there can be no non-degenerate it. 8
10 c) Note that w(f ). Note that 1 F (t + xh(t)) t 1 F (t) t t ( t t ( ex( x) ( 1 + xh (t) ) f (t + xh(t)) f (t) ( 1 + xh (t) ) ex [b (t + xh(t)) η ex (bt + bxh(t))] ) 1 + xh (t) ) 1 + xh (t) ex [bt η ex(bt)] ex {bxh(t) + η ex(bt) [1 ex (bxh(t))]} ex {bxh(t) η ex(bt)bxh(t)} 1 if h(t). So, F (x) belongs to the Gumbel domain of attraction. ηb ex(bt) d) Note that w(f ). Then 1 F (tx) t 1 F (t) xf (tx) t f(t) ( ) x(tx) α 1 ex β tx t t α 1 ex ( ) β t x(tx) α 1 t t α 1 x α. So, F (x) belongs to the Fréchet domain of attraction. e) Note that w(f ). Then 1 F (t + xh(t)) t 1 F (t) t 1 [1 + ex ( at axh(t))] b 1 [1 + ex ( at)] b 1 [1 b ex ( at axh(t))] t 1 [1 b ex ( at)] ex ( at axh(t)) t ex ( at) ex ( axh(t)) t ex( x) 9
11 if h(t) 1. So, the cdf F (x) belongs to the Gumbel domain of attraction. a 1
12 Solutions to Question 4 (a) If X is an absolutely continuous random variable with cdf F ( ) then VaR (X) F 1 () and ES (X) 1 F 1 (v)dv. SEEN (b) (i) T is a N (µ 1, σ1)+ 2 +N (µ k, σk 2) N (µ µ k, σ σk 2 ) random variable; (b) (ii) Inverting Φ ( t µ 1 µ k σ σ 2 k ), we obtain VaR (T ) µ µ k + σ σ 2 k Φ 1 (). (b) (iii) The exected shortfall is ES (T ) 1 [ ] µ µ k + σ σk 2 Φ 1 (v) dv µ µ k + σ σk 2 1 Φ 1 (v)dv. 11
13 c) (i) The joint likelihood function of µ 1, µ 2,..., µ k and σ1, 2 σ2, 2..., σk 2 is L ( ) µ 1, µ 2,..., µ k, σ1, 2 σ2, 2..., σk 2 { [ ]} k n 1 ex 2πσi i1 { k i1 1 (2π) n σ n i 1 (2π) nk σ n 1 σ n k (X i,j µ i ) 2 2σi 2 [ ]} ex 1 (X i,j µ i ) 2 ex [ 2σ 2 i 1 2 k i1 1 σ 2 i ] (X i,j µ i ) 2. c) (ii) The log likelihood function is log L nk log(2π) n k log σ i 1 2 i1 k 1 σ 2 i1 i (X i,j µ i ) 2. The artial derivatives are log L µ i 1 σ 2 i (X i,j µ i ) 1 σi 2 [( ) ] X i,j nµ i and log L σ i n σ i + 1 σ 3 i (X i,j µ i ) 2. Setting these to zero and solving, we obtain µ i 1 n X i,j and σ 2 i 1 n (X i,j µ i ) 2. 12
14 c) (iii) µ i is unbiased and consistent since E ( µ i ) 1 n E (X i,j ) 1 n µ i µ i and V ar ( µ i ) 1 n 2 V ar (X i,j ) 1 n 2 σ 2 i σ2 i n. c) (iv) σ 2 i is unbiased and consistent since E ( σ ) [ ] 2 i σ2 i n E 1 (X i,j µ i ) 2 σ 2 i σ2 i n E [ ] χ 2 (n 1)σ 2 n 1 i n and V ar ( σ i 2 ) V ar [ σ 2 i n 1 σ 2 i ] (X i,j µ i ) 2 σ4 i n 2 V ar [ 1 σ 2 i ] (X i,j µ i ) 2 σ4 i n V ar [ ] χ 2 2σ 4 2 n 1 i (n 1). n 2 c (v) The maximum likelihood estimators of VaR (T ) and ES (T ) are VaR (T ) 1 n k X i,j + 1 n i1 k (X i,j µ i ) 2 Φ 1 () i1 and ÊS (T ) 1 n k X i,j + 1 n i1 k i1 (X i,j µ i ) 2 1 Φ 1 (v)dv. 13
15 Solutions to Question 5 a) Note that for t > min (a 1, a 2,..., a k ). F T (t) Pr(T t) 1 Pr(T > t) 1 Pr (min (X 1, X 2,..., X k ) > t) 1 Pr (X 1 > t, X 2 > t,..., X k > t) 1 F (t, t,..., t) [ ( t 1 max, a 1 [ 1 max t a 2,..., t a k )] a ( 1, 1,..., 1 a 1 a 2 a k 1 [min (a 1, a 2,..., a k )] a t a )] a t a (6 marks) b) The corresonding df is f T (t) a [min (a 1, a 2,..., a k )] a t a 1 for t > min (a 1, a 2,..., a k ). c) Inverting 1 [min (a 1, a 2,..., a k )] a t a gives VaR (T ) min (a 1, a 2,..., a k ) (1 ) 1/a. 14
16 d) The exected shortfall is ES (T ) min (a 1, a 2,..., a k ) min (a 1, a 2,..., a k ) ( 1 1) a min (a 1, a 2,..., a k ) ( 1 1) a (1 u) 1 a du [ (1 u) 1 1 a ] [(1 ) 1 1 a 1 ]. e) The likelihood function is ( n ) a 1 { n } L (a, a 1,..., a k ) a n [min (a 1, a 2,..., a k )] na t i I [t i > min (a 1,..., a k )] i1 ( n ) a 1 a n [min (a 1, a 2,..., a k )] na t i {I [min (t 1,..., t n ) > min (a 1,..., a k )]}. As a function of min (a 1,..., a k ), it is increasing over (, min (t 1,..., t n )). Hence, the maximum likelihood estimator of a 1, a 2,..., a k are those values satisfying min (a 1,..., a k ) min (t 1,..., t n ). To find the maximum likelihood estimator of a, take the log of the likelihood log L (a, a 1,..., a k ) n log a + na log [min (a 1, a 2,..., a k )] (a + 1) The artial derivative with resect to a is log L a Setting this to zero gives { â n i1 n a + n log [min (a 1, a 2,..., a k )] n log [min (a 1, a 2,..., a k )] + i1 log t i. i1 } 1 log t i. This is a maximum likelihood estimator since 2 log L a 2 n a 2 <. i1 log t i. i1 15 (8 marks)
SOLUTIONS TO MATH38181 EXTREME VALUES AND FINANCIAL RISK EXAM
SOLUTIONS TO MATH38181 EXTREME VALUES AND FINANCIAL RISK EXAM Solutions to Question 1 a) The cumulative distribution function of T conditional on N n is Pr T t N n) Pr max X 1,..., X N ) t N n) Pr max
Διαβάστε περισσότεραStatistical Inference I Locally most powerful tests
Statistical Inference I Locally most powerful tests Shirsendu Mukherjee Department of Statistics, Asutosh College, Kolkata, India. shirsendu st@yahoo.co.in So far we have treated the testing of one-sided
Διαβάστε περισσότεραOther Test Constructions: Likelihood Ratio & Bayes Tests
Other Test Constructions: Likelihood Ratio & Bayes Tests Side-Note: So far we have seen a few approaches for creating tests such as Neyman-Pearson Lemma ( most powerful tests of H 0 : θ = θ 0 vs H 1 :
Διαβάστε περισσότεραSection 8.3 Trigonometric Equations
99 Section 8. Trigonometric Equations Objective 1: Solve Equations Involving One Trigonometric Function. In this section and the next, we will exple how to solving equations involving trigonometric functions.
Διαβάστε περισσότεραSolution Series 9. i=1 x i and i=1 x i.
Lecturer: Prof. Dr. Mete SONER Coordinator: Yilin WANG Solution Series 9 Q1. Let α, β >, the p.d.f. of a beta distribution with parameters α and β is { Γ(α+β) Γ(α)Γ(β) f(x α, β) xα 1 (1 x) β 1 for < x
Διαβάστε περισσότεραAn Inventory of Continuous Distributions
Appendi A An Inventory of Continuous Distributions A.1 Introduction The incomplete gamma function is given by Also, define Γ(α; ) = 1 with = G(α; ) = Z 0 Z 0 Z t α 1 e t dt, α > 0, >0 t α 1 e t dt, α >
Διαβάστε περισσότεραANSWERSHEET (TOPIC = DIFFERENTIAL CALCULUS) COLLECTION #2. h 0 h h 0 h h 0 ( ) g k = g 0 + g 1 + g g 2009 =?
Teko Classes IITJEE/AIEEE Maths by SUHAAG SIR, Bhopal, Ph (0755) 3 00 000 www.tekoclasses.com ANSWERSHEET (TOPIC DIFFERENTIAL CALCULUS) COLLECTION # Question Type A.Single Correct Type Q. (A) Sol least
Διαβάστε περισσότεραMatrices and Determinants
Matrices and Determinants SUBJECTIVE PROBLEMS: Q 1. For what value of k do the following system of equations possess a non-trivial (i.e., not all zero) solution over the set of rationals Q? x + ky + 3z
Διαβάστε περισσότερα6. MAXIMUM LIKELIHOOD ESTIMATION
6 MAXIMUM LIKELIHOOD ESIMAION [1] Maximum Likelihood Estimator (1) Cases in which θ (unknown parameter) is scalar Notational Clarification: From now on, we denote the true value of θ as θ o hen, view θ
Διαβάστε περισσότεραST5224: Advanced Statistical Theory II
ST5224: Advanced Statistical Theory II 2014/2015: Semester II Tutorial 7 1. Let X be a sample from a population P and consider testing hypotheses H 0 : P = P 0 versus H 1 : P = P 1, where P j is a known
Διαβάστε περισσότερα2 Composition. Invertible Mappings
Arkansas Tech University MATH 4033: Elementary Modern Algebra Dr. Marcel B. Finan Composition. Invertible Mappings In this section we discuss two procedures for creating new mappings from old ones, namely,
Διαβάστε περισσότεραExample Sheet 3 Solutions
Example Sheet 3 Solutions. i Regular Sturm-Liouville. ii Singular Sturm-Liouville mixed boundary conditions. iii Not Sturm-Liouville ODE is not in Sturm-Liouville form. iv Regular Sturm-Liouville note
Διαβάστε περισσότεραLecture 34 Bootstrap confidence intervals
Lecture 34 Bootstrap confidence intervals Confidence Intervals θ: an unknown parameter of interest We want to find limits θ and θ such that Gt = P nˆθ θ t If G 1 1 α is known, then P θ θ = P θ θ = 1 α
Διαβάστε περισσότεραProblem Set 3: Solutions
CMPSCI 69GG Applied Information Theory Fall 006 Problem Set 3: Solutions. [Cover and Thomas 7.] a Define the following notation, C I p xx; Y max X; Y C I p xx; Ỹ max I X; Ỹ We would like to show that C
Διαβάστε περισσότεραFinite Field Problems: Solutions
Finite Field Problems: Solutions 1. Let f = x 2 +1 Z 11 [x] and let F = Z 11 [x]/(f), a field. Let Solution: F =11 2 = 121, so F = 121 1 = 120. The possible orders are the divisors of 120. Solution: The
Διαβάστε περισσότεραInverse trigonometric functions & General Solution of Trigonometric Equations. ------------------ ----------------------------- -----------------
Inverse trigonometric functions & General Solution of Trigonometric Equations. 1. Sin ( ) = a) b) c) d) Ans b. Solution : Method 1. Ans a: 17 > 1 a) is rejected. w.k.t Sin ( sin ) = d is rejected. If sin
Διαβάστε περισσότεραEcon 2110: Fall 2008 Suggested Solutions to Problem Set 8 questions or comments to Dan Fetter 1
Eon : Fall 8 Suggested Solutions to Problem Set 8 Email questions or omments to Dan Fetter Problem. Let X be a salar with density f(x, θ) (θx + θ) [ x ] with θ. (a) Find the most powerful level α test
Διαβάστε περισσότεραChapter 6: Systems of Linear Differential. be continuous functions on the interval
Chapter 6: Systems of Linear Differential Equations Let a (t), a 2 (t),..., a nn (t), b (t), b 2 (t),..., b n (t) be continuous functions on the interval I. The system of n first-order differential equations
Διαβάστε περισσότεραMean-Variance Analysis
Mean-Variance Analysis Jan Schneider McCombs School of Business University of Texas at Austin Jan Schneider Mean-Variance Analysis Beta Representation of the Risk Premium risk premium E t [Rt t+τ ] R1
Διαβάστε περισσότεραSolutions to Exercise Sheet 5
Solutions to Eercise Sheet 5 jacques@ucsd.edu. Let X and Y be random variables with joint pdf f(, y) = 3y( + y) where and y. Determine each of the following probabilities. Solutions. a. P (X ). b. P (X
Διαβάστε περισσότεραSCHOOL OF MATHEMATICAL SCIENCES G11LMA Linear Mathematics Examination Solutions
SCHOOL OF MATHEMATICAL SCIENCES GLMA Linear Mathematics 00- Examination Solutions. (a) i. ( + 5i)( i) = (6 + 5) + (5 )i = + i. Real part is, imaginary part is. (b) ii. + 5i i ( + 5i)( + i) = ( i)( + i)
Διαβάστε περισσότεραOrdinal Arithmetic: Addition, Multiplication, Exponentiation and Limit
Ordinal Arithmetic: Addition, Multiplication, Exponentiation and Limit Ting Zhang Stanford May 11, 2001 Stanford, 5/11/2001 1 Outline Ordinal Classification Ordinal Addition Ordinal Multiplication Ordinal
Διαβάστε περισσότεραSrednicki Chapter 55
Srednicki Chapter 55 QFT Problems & Solutions A. George August 3, 03 Srednicki 55.. Use equations 55.3-55.0 and A i, A j ] = Π i, Π j ] = 0 (at equal times) to verify equations 55.-55.3. This is our third
Διαβάστε περισσότεραIntroduction to the ML Estimation of ARMA processes
Introduction to the ML Estimation of ARMA processes Eduardo Rossi University of Pavia October 2013 Rossi ARMA Estimation Financial Econometrics - 2013 1 / 1 We consider the AR(p) model: Y t = c + φ 1 Y
Διαβάστε περισσότεραHOMEWORK 4 = G. In order to plot the stress versus the stretch we define a normalized stretch:
HOMEWORK 4 Problem a For the fast loading case, we want to derive the relationship between P zz and λ z. We know that the nominal stress is expressed as: P zz = ψ λ z where λ z = λ λ z. Therefore, applying
Διαβάστε περισσότερα6.3 Forecasting ARMA processes
122 CHAPTER 6. ARMA MODELS 6.3 Forecasting ARMA processes The purpose of forecasting is to predict future values of a TS based on the data collected to the present. In this section we will discuss a linear
Διαβάστε περισσότεραC.S. 430 Assignment 6, Sample Solutions
C.S. 430 Assignment 6, Sample Solutions Paul Liu November 15, 2007 Note that these are sample solutions only; in many cases there were many acceptable answers. 1 Reynolds Problem 10.1 1.1 Normal-order
Διαβάστε περισσότεραCHAPTER 25 SOLVING EQUATIONS BY ITERATIVE METHODS
CHAPTER 5 SOLVING EQUATIONS BY ITERATIVE METHODS EXERCISE 104 Page 8 1. Find the positive root of the equation x + 3x 5 = 0, correct to 3 significant figures, using the method of bisection. Let f(x) =
Διαβάστε περισσότεραExercises to Statistics of Material Fatigue No. 5
Prof. Dr. Christine Müller Dipl.-Math. Christoph Kustosz Eercises to Statistics of Material Fatigue No. 5 E. 9 (5 a Show, that a Fisher information matri for a two dimensional parameter θ (θ,θ 2 R 2, can
Διαβάστε περισσότεραHomework 8 Model Solution Section
MATH 004 Homework Solution Homework 8 Model Solution Section 14.5 14.6. 14.5. Use the Chain Rule to find dz where z cosx + 4y), x 5t 4, y 1 t. dz dx + dy y sinx + 4y)0t + 4) sinx + 4y) 1t ) 0t + 4t ) sinx
Διαβάστε περισσότεραHOMEWORK#1. t E(x) = 1 λ = (b) Find the median lifetime of a randomly selected light bulb. Answer:
HOMEWORK# 52258 李亞晟 Eercise 2. The lifetime of light bulbs follows an eponential distribution with a hazard rate of. failures per hour of use (a) Find the mean lifetime of a randomly selected light bulb.
Διαβάστε περισσότεραPractice Exam 2. Conceptual Questions. 1. State a Basic identity and then verify it. (a) Identity: Solution: One identity is csc(θ) = 1
Conceptual Questions. State a Basic identity and then verify it. a) Identity: Solution: One identity is cscθ) = sinθ) Practice Exam b) Verification: Solution: Given the point of intersection x, y) of the
Διαβάστε περισσότεραHW 3 Solutions 1. a) I use the auto.arima R function to search over models using AIC and decide on an ARMA(3,1)
HW 3 Solutions a) I use the autoarima R function to search over models using AIC and decide on an ARMA3,) b) I compare the ARMA3,) to ARMA,0) ARMA3,) does better in all three criteria c) The plot of the
Διαβάστε περισσότεραSolution to Review Problems for Midterm III
Solution to Review Problems for Mierm III Mierm III: Friday, November 19 in class Topics:.8-.11, 4.1,4. 1. Find the derivative of the following functions and simplify your answers. (a) x(ln(4x)) +ln(5
Διαβάστε περισσότεραAreas and Lengths in Polar Coordinates
Kiryl Tsishchanka Areas and Lengths in Polar Coordinates In this section we develop the formula for the area of a region whose boundary is given by a polar equation. We need to use the formula for the
Διαβάστε περισσότεραAreas and Lengths in Polar Coordinates
Kiryl Tsishchanka Areas and Lengths in Polar Coordinates In this section we develop the formula for the area of a region whose boundary is given by a polar equation. We need to use the formula for the
Διαβάστε περισσότερα4.6 Autoregressive Moving Average Model ARMA(1,1)
84 CHAPTER 4. STATIONARY TS MODELS 4.6 Autoregressive Moving Average Model ARMA(,) This section is an introduction to a wide class of models ARMA(p,q) which we will consider in more detail later in this
Διαβάστε περισσότεραMath221: HW# 1 solutions
Math: HW# solutions Andy Royston October, 5 7.5.7, 3 rd Ed. We have a n = b n = a = fxdx = xdx =, x cos nxdx = x sin nx n sin nxdx n = cos nx n = n n, x sin nxdx = x cos nx n + cos nxdx n cos n = + sin
Διαβάστε περισσότεραHomework 3 Solutions
Homework 3 Solutions Igor Yanovsky (Math 151A TA) Problem 1: Compute the absolute error and relative error in approximations of p by p. (Use calculator!) a) p π, p 22/7; b) p π, p 3.141. Solution: For
Διαβάστε περισσότεραThe Simply Typed Lambda Calculus
Type Inference Instead of writing type annotations, can we use an algorithm to infer what the type annotations should be? That depends on the type system. For simple type systems the answer is yes, and
Διαβάστε περισσότεραSCITECH Volume 13, Issue 2 RESEARCH ORGANISATION Published online: March 29, 2018
Journal of rogressive Research in Mathematics(JRM) ISSN: 2395-028 SCITECH Volume 3, Issue 2 RESEARCH ORGANISATION ublished online: March 29, 208 Journal of rogressive Research in Mathematics www.scitecresearch.com/journals
Διαβάστε περισσότεραUniform Convergence of Fourier Series Michael Taylor
Uniform Convergence of Fourier Series Michael Taylor Given f L 1 T 1 ), we consider the partial sums of the Fourier series of f: N 1) S N fθ) = ˆfk)e ikθ. k= N A calculation gives the Dirichlet formula
Διαβάστε περισσότερα( y) Partial Differential Equations
Partial Dierential Equations Linear P.D.Es. contains no owers roducts o the deendent variables / an o its derivatives can occasionall be solved. Consider eamle ( ) a (sometimes written as a ) we can integrate
Διαβάστε περισσότεραLecture 21: Properties and robustness of LSE
Lecture 21: Properties and robustness of LSE BLUE: Robustness of LSE against normality We now study properties of l τ β and σ 2 under assumption A2, i.e., without the normality assumption on ε. From Theorem
Διαβάστε περισσότεραPhys460.nb Solution for the t-dependent Schrodinger s equation How did we find the solution? (not required)
Phys460.nb 81 ψ n (t) is still the (same) eigenstate of H But for tdependent H. The answer is NO. 5.5.5. Solution for the tdependent Schrodinger s equation If we assume that at time t 0, the electron starts
Διαβάστε περισσότεραEE512: Error Control Coding
EE512: Error Control Coding Solution for Assignment on Finite Fields February 16, 2007 1. (a) Addition and Multiplication tables for GF (5) and GF (7) are shown in Tables 1 and 2. + 0 1 2 3 4 0 0 1 2 3
Διαβάστε περισσότεραBayesian statistics. DS GA 1002 Probability and Statistics for Data Science.
Bayesian statistics DS GA 1002 Probability and Statistics for Data Science http://www.cims.nyu.edu/~cfgranda/pages/dsga1002_fall17 Carlos Fernandez-Granda Frequentist vs Bayesian statistics In frequentist
Διαβάστε περισσότεραk A = [k, k]( )[a 1, a 2 ] = [ka 1,ka 2 ] 4For the division of two intervals of confidence in R +
Chapter 3. Fuzzy Arithmetic 3- Fuzzy arithmetic: ~Addition(+) and subtraction (-): Let A = [a and B = [b, b in R If x [a and y [b, b than x+y [a +b +b Symbolically,we write A(+)B = [a (+)[b, b = [a +b
Διαβάστε περισσότεραJesse Maassen and Mark Lundstrom Purdue University November 25, 2013
Notes on Average Scattering imes and Hall Factors Jesse Maassen and Mar Lundstrom Purdue University November 5, 13 I. Introduction 1 II. Solution of the BE 1 III. Exercises: Woring out average scattering
Διαβάστε περισσότεραChapter 6: Systems of Linear Differential. be continuous functions on the interval
Chapter 6: Systems of Linear Differential Equations Let a (t), a 2 (t),..., a nn (t), b (t), b 2 (t),..., b n (t) be continuous functions on the interval I. The system of n first-order differential equations
Διαβάστε περισσότεραCHAPTER 101 FOURIER SERIES FOR PERIODIC FUNCTIONS OF PERIOD
CHAPTER FOURIER SERIES FOR PERIODIC FUNCTIONS OF PERIOD EXERCISE 36 Page 66. Determine the Fourier series for the periodic function: f(x), when x +, when x which is periodic outside this rge of period.
Διαβάστε περισσότεραReminders: linear functions
Reminders: linear functions Let U and V be vector spaces over the same field F. Definition A function f : U V is linear if for every u 1, u 2 U, f (u 1 + u 2 ) = f (u 1 ) + f (u 2 ), and for every u U
Διαβάστε περισσότερα557: MATHEMATICAL STATISTICS II RESULTS FROM CLASSICAL HYPOTHESIS TESTING
Most Powerful Tests 557: MATHEMATICAL STATISTICS II RESULTS FROM CLASSICAL HYPOTHESIS TESTING To construct and assess the quality of a statistical test, we consider the power function β(θ). Consider a
Διαβάστε περισσότεραMath 6 SL Probability Distributions Practice Test Mark Scheme
Math 6 SL Probability Distributions Practice Test Mark Scheme. (a) Note: Award A for vertical line to right of mean, A for shading to right of their vertical line. AA N (b) evidence of recognizing symmetry
Διαβάστε περισσότεραSecond Order RLC Filters
ECEN 60 Circuits/Electronics Spring 007-0-07 P. Mathys Second Order RLC Filters RLC Lowpass Filter A passive RLC lowpass filter (LPF) circuit is shown in the following schematic. R L C v O (t) Using phasor
Διαβάστε περισσότεραThe challenges of non-stable predicates
The challenges of non-stable predicates Consider a non-stable predicate Φ encoding, say, a safety property. We want to determine whether Φ holds for our program. The challenges of non-stable predicates
Διαβάστε περισσότεραDESIGN OF MACHINERY SOLUTION MANUAL h in h 4 0.
DESIGN OF MACHINERY SOLUTION MANUAL -7-1! PROBLEM -7 Statement: Design a double-dwell cam to move a follower from to 25 6, dwell for 12, fall 25 and dwell for the remader The total cycle must take 4 sec
Διαβάστε περισσότερα3.4 SUM AND DIFFERENCE FORMULAS. NOTE: cos(α+β) cos α + cos β cos(α-β) cos α -cos β
3.4 SUM AND DIFFERENCE FORMULAS Page Theorem cos(αβ cos α cos β -sin α cos(α-β cos α cos β sin α NOTE: cos(αβ cos α cos β cos(α-β cos α -cos β Proof of cos(α-β cos α cos β sin α Let s use a unit circle
Διαβάστε περισσότερα1. A fully continuous 20-payment years, 30-year term life insurance of 2000 is issued to (35). You are given n A 1
Chapter 7: Exercises 1. A fully continuous 20-payment years, 30-year term life insurance of 2000 is issued to (35). You are given n A 1 35+n:30 n a 35+n:20 n 0 0.068727 11.395336 10 0.097101 7.351745 25
Διαβάστε περισσότεραEvery set of first-order formulas is equivalent to an independent set
Every set of first-order formulas is equivalent to an independent set May 6, 2008 Abstract A set of first-order formulas, whatever the cardinality of the set of symbols, is equivalent to an independent
Διαβάστε περισσότεραderivation of the Laplacian from rectangular to spherical coordinates
derivation of the Laplacian from rectangular to spherical coordinates swapnizzle 03-03- :5:43 We begin by recognizing the familiar conversion from rectangular to spherical coordinates (note that φ is used
Διαβάστε περισσότεραDurbin-Levinson recursive method
Durbin-Levinson recursive method A recursive method for computing ϕ n is useful because it avoids inverting large matrices; when new data are acquired, one can update predictions, instead of starting again
Διαβάστε περισσότεραD Alembert s Solution to the Wave Equation
D Alembert s Solution to the Wave Equation MATH 467 Partial Differential Equations J. Robert Buchanan Department of Mathematics Fall 2018 Objectives In this lesson we will learn: a change of variable technique
Διαβάστε περισσότεραBounding Nonsplitting Enumeration Degrees
Bounding Nonsplitting Enumeration Degrees Thomas F. Kent Andrea Sorbi Università degli Studi di Siena Italia July 18, 2007 Goal: Introduce a form of Σ 0 2-permitting for the enumeration degrees. Till now,
Διαβάστε περισσότεραNowhere-zero flows Let be a digraph, Abelian group. A Γ-circulation in is a mapping : such that, where, and : tail in X, head in
Nowhere-zero flows Let be a digraph, Abelian group. A Γ-circulation in is a mapping : such that, where, and : tail in X, head in : tail in X, head in A nowhere-zero Γ-flow is a Γ-circulation such that
Διαβάστε περισσότεραENGR 691/692 Section 66 (Fall 06): Machine Learning Assigned: August 30 Homework 1: Bayesian Decision Theory (solutions) Due: September 13
ENGR 69/69 Section 66 (Fall 06): Machine Learning Assigned: August 30 Homework : Bayesian Decision Theory (solutions) Due: Septemer 3 Prolem : ( pts) Let the conditional densities for a two-category one-dimensional
Διαβάστε περισσότεραMath 446 Homework 3 Solutions. (1). (i): Reverse triangle inequality for metrics: Let (X, d) be a metric space and let x, y, z X.
Math 446 Homework 3 Solutions. (1). (i): Reverse triangle inequalit for metrics: Let (X, d) be a metric space and let x,, z X. Prove that d(x, z) d(, z) d(x, ). (ii): Reverse triangle inequalit for norms:
Διαβάστε περισσότεραStatistics 104: Quantitative Methods for Economics Formula and Theorem Review
Harvard College Statistics 104: Quantitative Methods for Economics Formula and Theorem Review Tommy MacWilliam, 13 tmacwilliam@college.harvard.edu March 10, 2011 Contents 1 Introduction to Data 5 1.1 Sample
Διαβάστε περισσότεραLaplace Expansion. Peter McCullagh. WHOA-PSI, St Louis August, Department of Statistics University of Chicago
Laplace Expansion Peter McCullagh Department of Statistics University of Chicago WHOA-PSI, St Louis August, 2017 Outline Laplace approximation in 1D Laplace expansion in 1D Laplace expansion in R p Formal
Διαβάστε περισσότεραSecond Order Partial Differential Equations
Chapter 7 Second Order Partial Differential Equations 7.1 Introduction A second order linear PDE in two independent variables (x, y Ω can be written as A(x, y u x + B(x, y u xy + C(x, y u u u + D(x, y
Διαβάστε περισσότεραA Note on Intuitionistic Fuzzy. Equivalence Relation
International Mathematical Forum, 5, 2010, no. 67, 3301-3307 A Note on Intuitionistic Fuzzy Equivalence Relation D. K. Basnet Dept. of Mathematics, Assam University Silchar-788011, Assam, India dkbasnet@rediffmail.com
Διαβάστε περισσότεραTridiagonal matrices. Gérard MEURANT. October, 2008
Tridiagonal matrices Gérard MEURANT October, 2008 1 Similarity 2 Cholesy factorizations 3 Eigenvalues 4 Inverse Similarity Let α 1 ω 1 β 1 α 2 ω 2 T =......... β 2 α 1 ω 1 β 1 α and β i ω i, i = 1,...,
Διαβάστε περισσότερα1 String with massive end-points
1 String with massive end-points Πρόβλημα 5.11:Θεωρείστε μια χορδή μήκους, τάσης T, με δύο σημειακά σωματίδια στα άκρα της, το ένα μάζας m, και το άλλο μάζας m. α) Μελετώντας την κίνηση των άκρων βρείτε
Διαβάστε περισσότεραTheorem 8 Let φ be the most powerful size α test of H
Testing composite hypotheses Θ = Θ 0 Θ c 0 H 0 : θ Θ 0 H 1 : θ Θ c 0 Definition 16 A test φ is a uniformly most powerful (UMP) level α test for H 0 vs. H 1 if φ has level α and for any other level α test
Διαβάστε περισσότεραSection 7.6 Double and Half Angle Formulas
09 Section 7. Double and Half Angle Fmulas To derive the double-angles fmulas, we will use the sum of two angles fmulas that we developed in the last section. We will let α θ and β θ: cos(θ) cos(θ + θ)
Διαβάστε περισσότερα2. Let H 1 and H 2 be Hilbert spaces and let T : H 1 H 2 be a bounded linear operator. Prove that [T (H 1 )] = N (T ). (6p)
Uppsala Universitet Matematiska Institutionen Andreas Strömbergsson Prov i matematik Funktionalanalys Kurs: F3B, F4Sy, NVP 2005-03-08 Skrivtid: 9 14 Tillåtna hjälpmedel: Manuella skrivdon, Kreyszigs bok
Διαβάστε περισσότεραFourier Series. MATH 211, Calculus II. J. Robert Buchanan. Spring Department of Mathematics
Fourier Series MATH 211, Calculus II J. Robert Buchanan Department of Mathematics Spring 2018 Introduction Not all functions can be represented by Taylor series. f (k) (c) A Taylor series f (x) = (x c)
Διαβάστε περισσότεραECON 381 SC ASSIGNMENT 2
ECON 8 SC ASSIGNMENT 2 JOHN HILLAS UNIVERSITY OF AUCKLAND Problem Consider a consmer with wealth w who consmes two goods which we shall call goods and 2 Let the amont of good l that the consmer consmes
Διαβάστε περισσότερα12. Radon-Nikodym Theorem
Tutorial 12: Radon-Nikodym Theorem 1 12. Radon-Nikodym Theorem In the following, (Ω, F) is an arbitrary measurable space. Definition 96 Let μ and ν be two (possibly complex) measures on (Ω, F). We say
Διαβάστε περισσότεραCongruence Classes of Invertible Matrices of Order 3 over F 2
International Journal of Algebra, Vol. 8, 24, no. 5, 239-246 HIKARI Ltd, www.m-hikari.com http://dx.doi.org/.2988/ija.24.422 Congruence Classes of Invertible Matrices of Order 3 over F 2 Ligong An and
Διαβάστε περισσότερα6.1. Dirac Equation. Hamiltonian. Dirac Eq.
6.1. Dirac Equation Ref: M.Kaku, Quantum Field Theory, Oxford Univ Press (1993) η μν = η μν = diag(1, -1, -1, -1) p 0 = p 0 p = p i = -p i p μ p μ = p 0 p 0 + p i p i = E c 2 - p 2 = (m c) 2 H = c p 2
Διαβάστε περισσότεραforms This gives Remark 1. How to remember the above formulas: Substituting these into the equation we obtain with
Week 03: C lassification of S econd- Order L inear Equations In last week s lectures we have illustrated how to obtain the general solutions of first order PDEs using the method of characteristics. We
Διαβάστε περισσότεραProbability and Random Processes (Part II)
Probability and Random Processes (Part II) 1. If the variance σ x of d(n) = x(n) x(n 1) is one-tenth the variance σ x of a stationary zero-mean discrete-time signal x(n), then the normalized autocorrelation
Διαβάστε περισσότεραΑπόκριση σε Μοναδιαία Ωστική Δύναμη (Unit Impulse) Απόκριση σε Δυνάμεις Αυθαίρετα Μεταβαλλόμενες με το Χρόνο. Απόστολος Σ.
Απόκριση σε Δυνάμεις Αυθαίρετα Μεταβαλλόμενες με το Χρόνο The time integral of a force is referred to as impulse, is determined by and is obtained from: Newton s 2 nd Law of motion states that the action
Διαβάστε περισσότεραω ω ω ω ω ω+2 ω ω+2 + ω ω ω ω+2 + ω ω+1 ω ω+2 2 ω ω ω ω ω ω ω ω+1 ω ω2 ω ω2 + ω ω ω2 + ω ω ω ω2 + ω ω+1 ω ω2 + ω ω+1 + ω ω ω ω2 + ω
0 1 2 3 4 5 6 ω ω + 1 ω + 2 ω + 3 ω + 4 ω2 ω2 + 1 ω2 + 2 ω2 + 3 ω3 ω3 + 1 ω3 + 2 ω4 ω4 + 1 ω5 ω 2 ω 2 + 1 ω 2 + 2 ω 2 + ω ω 2 + ω + 1 ω 2 + ω2 ω 2 2 ω 2 2 + 1 ω 2 2 + ω ω 2 3 ω 3 ω 3 + 1 ω 3 + ω ω 3 +
Διαβάστε περισσότεραSTAT200C: Hypothesis Testing
STAT200C: Hypothesis Testing Zhaoxia Yu Spring 2017 Some Definitions A hypothesis is a statement about a population parameter. The two complementary hypotheses in a hypothesis testing are the null hypothesis
Διαβάστε περισσότεραAn Introduction to Signal Detection and Estimation - Second Edition Chapter II: Selected Solutions
An Introduction to Signal Detection Estimation - Second Edition Chapter II: Selected Solutions H V Poor Princeton University March 16, 5 Exercise : The likelihood ratio is given by L(y) (y +1), y 1 a With
Διαβάστε περισσότερα5.4 The Poisson Distribution.
The worst thing you can do about a situation is nothing. Sr. O Shea Jackson 5.4 The Poisson Distribution. Description of the Poisson Distribution Discrete probability distribution. The random variable
Διαβάστε περισσότεραFractional Colorings and Zykov Products of graphs
Fractional Colorings and Zykov Products of graphs Who? Nichole Schimanski When? July 27, 2011 Graphs A graph, G, consists of a vertex set, V (G), and an edge set, E(G). V (G) is any finite set E(G) is
Διαβάστε περισσότεραb. Use the parametrization from (a) to compute the area of S a as S a ds. Be sure to substitute for ds!
MTH U341 urface Integrals, tokes theorem, the divergence theorem To be turned in Wed., Dec. 1. 1. Let be the sphere of radius a, x 2 + y 2 + z 2 a 2. a. Use spherical coordinates (with ρ a) to parametrize.
Διαβάστε περισσότεραEstimation for ARMA Processes with Stable Noise. Matt Calder & Richard A. Davis Colorado State University
Estimation for ARMA Processes with Stable Noise Matt Calder & Richard A. Davis Colorado State University rdavis@stat.colostate.edu 1 ARMA processes with stable noise Review of M-estimation Examples of
Διαβάστε περισσότεραAdditional Results for the Pareto/NBD Model
Additional Results for the Pareto/NBD Model Peter S. Fader www.petefader.com Bruce G. S. Hardie www.brucehardie.com January 24 Abstract This note derives expressions for i) the raw moments of the posterior
Διαβάστε περισσότερα5. Choice under Uncertainty
5. Choice under Uncertainty Daisuke Oyama Microeconomics I May 23, 2018 Formulations von Neumann-Morgenstern (1944/1947) X: Set of prizes Π: Set of probability distributions on X : Preference relation
Διαβάστε περισσότεραIntroduction to Time Series Analysis. Lecture 16.
Introduction to Time Series Analysis. Lecture 16. 1. Review: Spectral density 2. Examples 3. Spectral distribution function. 4. Autocovariance generating function and spectral density. 1 Review: Spectral
Διαβάστε περισσότεραSection 8.2 Graphs of Polar Equations
Section 8. Graphs of Polar Equations Graphing Polar Equations The graph of a polar equation r = f(θ), or more generally F(r,θ) = 0, consists of all points P that have at least one polar representation
Διαβάστε περισσότεραDynamic types, Lambda calculus machines Section and Practice Problems Apr 21 22, 2016
Harvard School of Engineering and Applied Sciences CS 152: Programming Languages Dynamic types, Lambda calculus machines Apr 21 22, 2016 1 Dynamic types and contracts (a) To make sure you understand the
Διαβάστε περισσότεραStrain gauge and rosettes
Strain gauge and rosettes Introduction A strain gauge is a device which is used to measure strain (deformation) on an object subjected to forces. Strain can be measured using various types of devices classified
Διαβάστε περισσότεραThe Pohozaev identity for the fractional Laplacian
The Pohozaev identity for the fractional Laplacian Xavier Ros-Oton Departament Matemàtica Aplicada I, Universitat Politècnica de Catalunya (joint work with Joaquim Serra) Xavier Ros-Oton (UPC) The Pohozaev
Διαβάστε περισσότεραList MF20. List of Formulae and Statistical Tables. Cambridge Pre-U Mathematics (9794) and Further Mathematics (9795)
List MF0 List of Formulae and Statistical Tables Cambridge Pre-U Mathematics (979) and Further Mathematics (979) For use from 07 in all aers for the above syllabuses. CST7 Mensuration Surface area of shere
Διαβάστε περισσότεραECE598: Information-theoretic methods in high-dimensional statistics Spring 2016
ECE598: Information-theoretic methods in high-dimensional statistics Spring 06 Lecture 7: Information bound Lecturer: Yihong Wu Scribe: Shiyu Liang, Feb 6, 06 [Ed. Mar 9] Recall the Chi-squared divergence
Διαβάστε περισσότερα