Subject index. Symbols β weights η φ * comment /* and */ comment...81

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1 Subject index Symbols β weights η φ * comment /* and */ comment...81 A acquiring datasets add, label define option... 2 agreement, intraclass correlation alpha reliability ameans command...93 analysis of covariance... see ANCOVA analysis of variance...see ANOVA ANCOVA ANOVA, degrees of freedom equal-variance test one-way repeated-measures two-way ANOVA assumptions ATS at UCLA B bar chart , 312 bar graph of means Bartlett test of equal variances beta weights , 254 limitation binary variables block regression blog... see Stata Blog Bonferroni multiple-comparison test , 209 bookstore, Stata bootstrap regression Boston College Stata site box plot , 220 C casewise deletion categorical covariates , categorical predictors, regression cause and effect center command chi-squared table test , 314 chitable command clear command codebook command , 51 52, 134 codebook example coding system coefficient of variation Cohen s d collinearity command structure Command window... 8, 9 confidence interval regression line slope constant continuous covariates conventions used in the book...1 copying, HTML format...18, 85 copying results to word processor...18, 84 correlate command correlation, interpreting limitation

2 394 Subject index correlation, continued multiple comparison correlation ratio , 230 count outcome variables Cramér s V, measure of association creating value labels criterion-related validity cross-tabulation D data, long format , 207 wide format , 207 Data Editor , dataset contents dataset, acquisition c10interaction , 294 c11barchart cancer... 10, 11 census censusfv chapter6 aspirin chapter13 missing chores create descriptive gss...96, 115, 116 divorce download... xxiii, environ firstsurvey...42 firstsurvey chapter , 82, 88 gss2002 and 2006 chapter gss2002 chapter gss2002 chapter , 159, 161, 169, 182 gss2002 chapter gss2002 chapter , 248 gss2002 chapter , 294 gss2002 chapter gss2006 chapter , 133, 144 dataset, continued gss2006 chapter6 10percent gss2006 chapter , 202, 203 gss2006 chapter8 selected gss2006 chapter , 222 gss2006 chapter9 2way gss2006 chapter , 333 gss2006 chapter12 selected intraclass kappa kuder-richardson long nlsy97 chapter , 181 nlsy97 chapter , 314 nlsy97 selected variables , 272 ops partyid...208, 218, 248 positive regsmpl relate... xxiii, 48, 71 relate small...xxiii retest severity spearman , 203 wide wide degrees of freedom, ANOVA one-sample t test dependent t test dependent variable describe command...10, 44 45, 49 dfbeta command dialog box, describe egen generate... 61, graph bar graph pie histogram , 103 logistic margins

3 Subject index 395 dialog box, continued open prtest recode regress...197, 251 scatter Submit vs. OK summarize tab tabi table tabstat tabulate , , 134 ttest , dictionary file...48 difference of means test difference of proportions test do-file, continuation line introduction...6 Do-file Editor download datasets drop command dummy variables E effect size, , 231, 255 η , 230 egen command... 61, 66 68, 327 egen count command egen rowmean command...68, 327 egen rowmiss command...67 egenmore command entering data equal variance, Bartlett test ereturn list command estat vif postestimation command estimates store command exit Stata...18, 42 exponentiation external validity F F ratio F test of unequal variances Facebook... see Stata on Facebook factor analysis, commonality eigenvalue...345, 350 exploratory factor analysis extraction factor score , 354 loading oblique rotation , 352 orthogonal rotation...345, 351 PCF PF postestimation principal component analysis principal-component factor analysis promax rotation scree plot , 350 simple structure varimax factor variables findit command...125, 378 fonts, fixed format, numeric...31 string fre command...98, 100 frequency distributions...97 ftable command G gamma, measure of association generate command geometric mean...93 Goodman and Kruskal s gamma, measure of association GradPlan graph, bar chart...103, 140, 312 box plot collinearity hanging rootogram heteroskedasticity

4 396 Subject index graph, continued histogram , 257 medians overlay two-way showing interaction effects pie chart residual versus fitted scattergram graph bar command , 217, 312 graph box command graphics book GUI interface, Edit Preferences...8 H harmonic mean help... 6 video...19 web-based...19 help, listcoef option help label command heteroskedasticity hierarchical regression , histogram histogram command , 257 HTML format I ice command imputation... see multiple imputation increment in R independent variable indicator variables interaction, regression interaction term interactive table intercept interquartile range interval-level variables intraclass correlation...244, 246 J jitter(), scatter option K kappa kappa, weighted kappa with three raters keep command Kendall s tau, measure of association Kruskal Wallis test, ANOVA alternative Kuder Richardson coefficient of reliability kurtosis... 95, 108, L label variable command labeling values...32 labeling variables likelihood-ratio chi-squared test limitations of Stata list, ereturn saved estimates list, return saved statistics list command , 208 list option, nolabel listcoef command listwise deletion log,.smcl extension log files...86 log files and graphs logistic command logistic regression bar chart exponentiation hypothesis tests interpreting odds ratio likelihood-ratio chi-squared test logits McFadden pseudo-r nested nonlinear odds ratio percentage change pseudo-r S-curve

5 Subject index 397 logistic regression, continued vs. OLS regression Wald chi-squared test logit command...300, logits long format , 164, 207, lrdrop1 command lrtest command M MAR margins command , marginsplot command maximum number of variables MCAR McFadden pseudo-r mean squares measure of association, η , 230 φ odds ratio V median command median, graph box plot menu, open...62 mi estimate command.. 363, mi impute chained command mi impute command mi impute mvn command...363, 368 mi register command mi set command mibeta command mim command missing, count missing values..27, 52, 63, 75, types...51, 52 misstable command more command...4, 42 multicollinearity multiple comparison, Bonferroni Scheffé Šidák multiple comparison and correlation multiple correlation multiple imputation multiple regression command multiple regression diagnostics multiple regression with interaction term multiple regression, block categorical predictors dummy variables hierarchical indicator variables influential case nested outlier residual weighted data mvdecode command... 52, 63, 163 N naming variables...25 nested regression , nestreg command , NetCourses nolabel, list option nominal-level variables...92 nonlinear nonparametric ANOVA alternatives nonparametric tests Mann Whitney median rank sum normally distributed residuals numlabel command...78, 100 O odds ratio , 302 interpretation percentage change OLS regression vs. logistic regression omega2 command one-sample t test one-way ANOVA

6 398 Subject index oneway option bonferroni scheffe sidak open existing dataset Stata-installed dataset...9 optifact command option, add, label define...2 help, listcoef jitter(), scatter percent, listcoef ordinal-level variables...92 outlier P paired t test part correlation pasting,...85 reformatting pasting results to word processor, formatting pcorr command , 276 Pearson s chi-squared percent, listcoef option pie chart plot a confidence interval Poisson regression postestimation command, estat vif predict , 283, 287 test power analysis powerreg command predict postestimation command , 283, 287 predict postregression predictive validity probability tables product term project outline...48 prophecy formula proportions, one-sample test two-sample test prtest command pseudo-r pwcorr command pweights pwmean command Q qualifier, if with missing values in R R change random sample how to draw random sampling randomization alternative to how to perform ranksum command recode command , 272 recoding ranges regress command , , , regression, block bootstrap categorical predictors dummy variables hierarchical indicator variables influential case nested outlier residual robust weighted data regression diagnostics regression line, plotting regression with interaction term

7 Subject index 399 reliability, alpha equivalent forms kappa kappa with three raters Kuder Richardson coefficient of reliability prophecy formula split-half test retest weighted kappa rename command... 53, 240 rename variable repeated-measures ANOVA repeated-measures t test replace command...61, 163 reshape command reshape wide to long format residual...260, 261 response variables Results window... 8 more... 4 scroll size... 4 return list command reverse coding reverse-code variables...56 Review window... 8 robust regression root mean squared error S sample, draw sample command...141, 185 sampsi command save command saved estimates saved statistics scale construction reverse coding scale creation scatter command scattergram scattergram with confidence interval scattergram with jitter() option..187 Scheffé, multiple comparison schemes scientific notation scree plot S-curve sdtest command seed for starting a random sample..185 semipartial correlation , 276 set more off command...4 set seed command...141, 150, 184 Šidák, multiple comparison significance, statistical substantive skewness... 95, 108, sktest command slope SMCL...86 spearman command Spearman s rho split-half reliability ssc command standardized beta coefficient standardized beta weights standardized regression coefficients Stat/Transfer Stata Blog Stata on Facebook Stata on Twitter Stata bookstore Stata code for textbook examples..378 Stata Journal Stata listserver Stata Markup and Control Language..... see SMCL Stata NetCourses Stata Portal, UCLA...192, 378, 381 Stata screen... 7 Stata tutorial...378, 383 Stata, limitations Stata/IC limitations Statalist statistical significance versus substantive significance

8 400 Subject index subcommand, list sum of squares summarize command , 108, 197, summarize(), tabulate option summary of data sunflower command sysuse command T t test, one-sample two-sample tab command tab1 command... 97, 193 tab2 command tabdisp command tabi command table probability summary statistics table command tabstat command...112, 219 tabulate command...60, 64 66, 97, , 132, , tau, measure of association test of significance, kurtosis skewness test postestimation command test retest reliability tests, Bonferroni chi-squared dependent t test likelihood-ratio chi-squared likelihood-ratio chi-squared with logistic regression logistic regression long format for portions Mann Whitney tests, continued median multiple comparison with correlations nonparametric one-sample t test paired t test proportions , 155 rank sum repeated-measures t test skewness and kurtosis two-sample t test unequal variances Wald chi-squared test wide format for proportions z test for proportions z test with logistic regression textbook examples using Stata commands tolerance toolbar, Stata...9 ttest command , 169 tutorial UNC, Population Center Twitter... see Stata on Twitter two-by-two table two-way ANOVA twoway command , 284, 287 U UCLA Stata Portal... 19, 192, 378 reshaping data wide to long user-written commands V validity, criterion related external predictive value labels... 23, 32 39, 53 56, 78 variable labels variable name...22, 25 Variables Manager , 69 Variables window... 8 variance inflation factor

9 Subject index 401 W Wald chi-squared test web search weighted data weighted kappa weights, pweights wide format , 165, 207, working directory... 9 X xtreg command xtset command Z z test, one-sample proportion two-sample proportion zero-inflated models