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1 Subject index Symbols β weights η φ * comment /* and */ comment...85 A acquiring datasets add, label define option...2 agreement, intraclass correlation alpha reliability ameans command...97 analysis of covariance...see ANCOVA analysis of variance...see ANOVA ANCOVA ANOVA, degrees of freedom equal-variance test one-way one-way power analysis , power analysis , repeated-measures repeated-measures power analysis two-way two-way power analysis ANOVA assumptions ATS at UCLA B bar chart...108, 350 bar graph of means Bartlett test of equal variances beta weights...210, 278 limitation binary variables binscatter command , 317 block regression blog...see Stata Blog Bonferroni multiple-comparison test , 223 bookstore, Stata bootstrap estimation of standard errors bootstrap regression Boston College Stata site boundary characteristic curve box plot...118, 237 C case, changing...48 casewise deletion categorical covariates , 243 categorical predictors, regression categorical variable cause and effect center command centering chi-squared table test...127, 353 chitable command clear command...29 clonevar command cls command codebook command , 55 56, 138 codebook example coding system coefficient of variation Cohen s d , Cohen s f , 263

2 538 Subject index collinearity command structure...78 Command window... 8, 10 compatibility...42 confidence interval regression line slope constant continuous covariates continuous variable conventions used in the book...1 copying, HTML format...19, 89 copying results to word processor...19, 88 correlate command correlation, interpreting limitation multiple comparison correlation ratio...226, count outcome variables Cramér s V, measure of association creating value labels criterion-related validity cross-tabulation curve fitting D data, long format , 221 wide format...160, 221 Data Editor , dataset contents...43 dataset, acquisition c10interaction...307, 330 c11barchart cancer...10, 11 census censusfv chapter6 aspirin chapter13 missing chores dataset, continued create depression descriptive gss...100, 120, 121 divorce download...xxxv, environ firstsurvey...43 firstsurvey chapter4...80, 85, 92 flourishing bmi , 423 gss2002 and 2006 chapter gss2002 chapter , 149 gss2002 chapter7..157, 163, 164, 166, 173, 187 gss2002 chapter gss2002 chapter gss2002 chapter , 330, 448 gss2002 chapter gss2006 chapter6..124, 137, 142, 145, 148 gss2006 chapter6 10percent gss2006 chapter , 215, 216 gss2006 chapter8 selected gss2006 chapter , 238 gss2006 chapter9 2way gss2006 chapter , 377 gss2006 chapter12 selected intraclass kappa kuder-richardson long longitudinal exercise longitudinal mixed nlsw nlsy97 chapter , 186 nlsy97 chapter , 353 nlsy97 selected variables , 296 ops , 420 partyid...222, 235, 271

3 Subject index 539 dataset, continued positive regsmpl...315, 407, 449 relate...xxxv, 52, 75 relate small... xxxv retest severity spearman , 216 wide wide degrees of freedom, ANOVA one-sample t test dependent t test dependent variable describe command...10, 46 47, 53 dfbeta command dialog box, alpha anova codebook correlate describe egen generate...65, graph bar , 231 graph box graph hbox graph pie histogram , kwallis lfit logistic margins...242, , 251 nestreg oneway open...66 pcorr power prtest recode , 297 regress...208, 275 rename...57 rvplot scatter dialog box, continued sdtest sktest Submit vs. OK summarize...11 tab tabi table tabstat tabulate , , 138 ttest , , 173 dictionary file...52 difference of means test difference of proportions test discontinuity graph display command , 348, do-file, continuation line introduction...6 Do-file Editor download datasets drop command...73 dummy variables E effect size , 226, 247, 279 η , egen command... 65, 70 72, 371 egen count command egen rowmean command...72, 371 egen rowmiss command...71 egenmore command entering data equal variance, Bartlett test esize command estat esize command estat report command estat vif postestimation command estimates store command Excel exporting data importing data exit Stata...18, 43

4 540 Subject index exponentiation external validity F F ratio F test of unequal variances Facebook...see Stata on Facebook factor analysis, commonality eigenvalue...389, 394 exploratory factor analysis extraction factor score , 398 loading oblique rotation...389, 396 orthogonal rotation...389, 395 PCF PF postestimation principal component analysis principal-component factor analysis promax rotation scree plot , 394 simple structure varimax factor variable fixed effects fonts, fixed format, numeric...31 string...32 fre command frequency distributions ftable command full mediation G gamma, measure of association generalized linear model generalized structural equation modeling generate command geometric mean...97 glm command Goodman and Kruskal s gamma, measure of association graded response IRT model GradPlan graph, alternative scattergram bar chart...108, 144, 350 box plot collinearity discontinuity hanging rootogram heteroskedasticity histogram...111, 281 medians overlay two-way showing interaction effects pie chart residual versus fitted scattergram graph bar command , 231, 350 graph box command Graph Editor graphics book growth curve gsem command , 453 logistic regression standardized solution GUI interface...8 H harmonic mean...97 help... 6 video...20 web-based...20 help, listcoef option help label command...43 heteroskedasticity hierarchical linear models hierarchical regression , , histogram histogram command , 281

5 Subject index 541 HLM...see hierarchical linear models HTML format...89 I ICC...see item characteristic curve imputation...see multiple imputation increment in R independent variable indicator variables interaction term interactive table intercept intercept: growth trajectory interquartile range interval-level variables intraclass correlation...260, 262 IRT...see item response theory irt 1pl command irt 2pl command irt grm command irtgraph icc command...491, 499, irtgraph iif command...493, 500, 507 irtgraph tif command...494, 501, 508 item characteristic curve , 491, 499 item information function graph , 500, item response theory J jitter(), scatter option K kappa kappa, weighted kappa with three raters keep command...73 Kendall s tau, measure of association Kruskal Wallis test, ANOVA alternative Kuder Richardson coefficient of reliability kurtosis...99, 113, 283 L label variable command labeling values...33 labeling variables...23 likelihood-ratio chi-squared test limitations of Stata linear regression list command , 222 list option, nolabel listcoef command listwise deletion log,.smcl extension...89 log files...89 log files and graphs...90 logistic command logistic regression , 441 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 vs. OLS regression Wald chi-squared test logit command...336, , logits long format...162, 169, 221, , 458 longitudinal data lrdrop1 command lrtest command...353

6 542 Subject index M MAR margins command.. 242, , 311, marginsplot command , maximum number of variables MCAR McFadden pseudo-r mean squares measure of association, η , φ odds ratio V median command median, graph box plot mediation correlated residuals full partial menu, open...66 mi estimate command mi impute chained command mi impute command mi impute mvn command...407, 412 mi register command mi set command mibeta command missing, count missing values...27, 56, 67, 79, , 456 types...55, 56 misstable command mixed command mixed models more command...4, 44 multicollinearity multilevel analysis 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...56, 67, 167 N naming variables...25 nested regression , , nestreg command , , NetCourses nolabel, list option nominal-level variables...96 nonlinear nonlinear regression nonparametric ANOVA alternatives nonparametric tests Mann Whitney median rank sum normally distributed residuals numlabel command...82, 104 O odds ratio , 338 interpretation percentage change OLS regression vs. logistic regression

7 Subject index 543 omega2 command one-sample t test one-parameter logistic IRT model one-way ANOVA oneway option bonferroni scheffe sidak open existing dataset Stata-installed dataset optifact command option, add, label define...2 help, listcoef jitter(), scatter percent, listcoef ordinal-level variables...96 outlier P paired t test panel data part correlation partial mediation pasting,...89 reformatting pasting results to word processor,...88 formatting path analysis pcorr command...279, 300 Pearson s chi-squared percent, listcoef option pie chart plot a confidence interval Poisson regression postestimation postestimation command, estat vif margins marginsplot predict , 307 test Postestimation Selector power analysis one-way ANOVA , repeated-measures ANOVA two means two-way ANOVA power command power oneway command , power repeated command power twomeans command power twoway command powerreg command predict command predict postestimation command , 307 predict postregression predictive validity probability tables product term project outline...52 prophecy formula proportions, one-sample test two-sample test prtest command pseudo-r pwcorr command pweights pwmean command Q quadratic model, centering examining fitting qualifier, if with missing values in R R , 276 change random coefficients ,

8 544 Subject index random effects random intercept , random sample how to draw random sampling random slope randomization alternative to how to perform ranksum command Rasch modeling recode command , 297 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 reliability, alpha equivalent forms IRT kappa kappa with three raters Kuder Richardson coefficient of reliability prophecy formula split-half test retest weighted kappa rename command...57, 256 rename variable repeated-measures ANOVA repeated-measures design repeated-measures t test replace command...65, 167 reshape command , 458 reshape wide to long format residual...284, 285 Results window...8 clear...16 more...4 scroll size... 4 reverse coding reverse-code variables...60 Review window...8 robust estimation of standard errors robust regression root mean squared error S sample, draw sample command...145, 191 SAS XPORT...48 save command saveold command...42 scale construction reverse coding scale creation...70 scatter command scattergram scattergram with confidence interval scattergram with jitter() option..194 scattergram, alternative Scheffé, multiple comparison schemes scientific notation scree plot S-curve sdtest command search command...6, 520 seed for starting a random sample..191 sem advantages...421

9 Subject index 545 SEM Builder restore default settings sem command , 453 sembuilder command semipartial correlation...279, 300 set more off command...4 set seed command...145, 154, 191 Šidák, multiple comparison significance, statistical substantive skewness...99, 113, 283 sktest command slope SMCL...see Stata Markup and Control Language spearman command Spearman s rho split-half reliability SPSS...48 ssc command standardized beta coefficient standardized beta weights standardized regression coefficients Stat/Transfer...48, 526 Stata, limitations Stata Blog Stata bookstore Stata code for textbook examples..520 Stata/IC limitations Stata Journal Stata Markup and Control Language Stata NetCourses Stata on Facebook Stata on Twitter Stata Portal, UCLA...203, 520, 523 Stata screen... 7 Stata tutorial...18, 525 Statalist Forum statistical significance versus substantive significance structural equation modeling sum of squares summarize command , 113, 208, 282 summarize(), tabulate option summary of data sunflower command sysuse command...10 T t test, one-sample power analysis two-sample tab command tab1 command , 204 tab2 command tabdisp command tabi command table probability summary statistics table calculator table command tabstat command...117, 235 tabulate command...64, 68 70, 101, , 136, , tau, measure of association test information function graph...494, 501, 508 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...353

10 546 Subject index tests, continued long format for portions Mann Whitney median multiple comparison with correlations nonparametric one-sample t test paired t test proportions , 159 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..353 textbook examples using Stata commands three-parameter logistic IRT model time-invariant covariate time-varying covariate tolerance toolbar, Stata for Mac...9 Stata for Windows... 9 ttest command , 173 tutorial tutorials...18 Twitter... see Stata on Twitter two-by-two table two-parameter logistic IRT model , two-way ANOVA twoway command , 308 twoway lfit command V validity, criterion related external predictive value labels...23, 33 40, 57 60, 82 variable labels...23 variable name...22, 25 reserved...22 Variables Manager , 57 59, 73 Variables window...8 variance inflation factor versions...42 video tutorials...18 VIF...see variance inflation factor W Wald chi-squared test web search weighted data weighted kappa weights, pweights wide format...160, 170, 221, , 457 working directory...9 X xtreg command xtset command Z z test, one-sample proportion two-sample proportion zero-inflated models U UCLA Stata Portal... 20, 203, 520 reshaping data wide to long user-written commands...520

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

Subject index. Symbols β weights η φ * comment /* and */ comment...81 Subject index Symbols β weights...254 η 2... 212 φ...129 * comment... 81 /* and */ comment...81 A acquiring datasets...383 384 add, label define option... 2 agreement, intraclass correlation... 244 alpha