# StataCorp LP

# Stata Technical Bulletin

This journal is no longer published by StataCorp LP. For a followup journal, see Stata Journal, published by StataCorp LP.
**Editor:** **For corrections or technical questions regarding this series, please contact (Christopher F. Baum) or (Lisa Gilmore)**

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### 2001, Volume 10, Issue 61

**y:2001:v:10:i:61:sg158.1 Update to random-effects ordered probit***by*Guillaume R. Frechette**y:2001:v:10:i:61:snp15.3 Update to somersd***by*Roger Newson**y:2001:v:10:i:61:sg163 Stereotype ordinal regression***by*Mark Lunt**y:2001:v:10:i:61:sg164 Specification tests for linear panel data models***by*Walter Sosa-Escudero & Anil K. Bera**y:2001:v:10:i:61:sbe19.4 Update to metabias to work under version 7***by*Thomas J. Steichen**y:2001:v:10:i:61:gr33.1 Violin plots for Stata 6 and 7***by*Thomas J. Steichen**y:2001:v:10:i:61:sbe39.2 Update of metatrim to work under version 7***by*Thomas J. Steichen**y:2001:v:10:i:61:gr42.1 Quantile plots, generalized: update to Stata 7.0***by*Nicholas J. Cox**y:2001:v:10:i:61:dm73.3 Contrasts for categorical variables: update***by*John Hendrickx**y:2001:v:10:i:61:an75 The Stata Journal begins publication fourth quarter 2001***by*H. Joseph Newton**y:2001:v:10:i:61:an76 Stata Journal subscriptions for STB subscribers***by*Patricia Branton**y:2001:v:10:i:61:an77 Past issues of the Stata Technical Bulletin***by*Patricia Branton**y:2001:v:10:i:61:dm91 Patterns of missing values***by*Jeroen Weesie**y:2001:v:10:i:61:dm92 Simulating disease status and censored age***by*Jisheng Cui

### 2001, Volume 10, Issue 60

**y:2001:v:10:i:60:sg160 On boundary-value likelihood-ratio tests***by*Roberto G. Gutierrez & Shana Carter & David M. Drukker**y:2001:v:10:i:60:sg161 Analysis of the turning point of a quadratic specification***by*Jeroen Weesie**y:2001:v:10:i:60:sg162 Tools for spatiel data analysis***by*Maurizio Pisati**y:2001:v:10:i:60:dm67.1 Enhancements to numbers of missing and present values***by*Nicholas J. Cox**y:2001:v:10:i:60:dm78.1 Describing variables in memory: update to Stata 7***by*Nicholas J. Cox**y:2001:v:10:i:60:sts18 A test for long-range dependence in a time series***by*Christopher F. Baum & Tairi Room**y:2001:v:10:i:60:sts19 Multivariate portmanteau (Q) test for white noise***by*Richard Sperling & Christopher F. Baum**y:2001:v:10:i:60:gr46 Display a graph of nonlinear effects***by*Jeroen Weesie**y:2001:v:10:i:60:dm87 Calculating the row product of observations***by*Philip Ryan**y:2001:v:10:i:60:dm88 Renaming variables, multiply and systematically***by*Nicholas J. Cox & Jeroen Weesie**y:2001:v:10:i:60:dm89 Dropping variables or observations with missing values***by*Nicholas J. Cox**y:2001:v:10:i:60:dm90 Listing distinct values of a variable***by*Nicholas J. Cox**y:2001:v:10:i:60:sxd4 Sample size estimation for cluster designed samples***by*Joanne M Garrett

### 2001, Volume 10, Issue 59

**y:2001:v:10:i:59:sg158 Random-effects ordered probit***by*Guillaume R. Frechette**y:2001:v:10:i:59:sg159 Confidence intervals for correlations***by*Paul T. Seed**y:2001:v:10:i:59:sbe36.1 Summary statistics for diagnostic tests***by*Paul T. Seed & Aurelio Tobias**y:2001:v:10:i:59:dm73.2 Contrasts for categorical variables: update***by*John Hendrickx**y:2001:v:10:i:59:sg97.3 Update to formatting regression output***by*John Luke Gallup**y:2001:v:10:i:59:ssa14 Global and multiple causes-of-death life tables from complete or aggregated vital data***by*Carlos Ramalheira**y:2001:v:10:i:59:sbe41 Ordinary case-cohort design and analysis***by*Vincenzo Coviello**y:2001:v:10:i:59:sbe42 Modeling the process of entry into the first marriage using Hernes model***by*Duolao Wang**y:2001:v:10:i:59:an74 Stata 6, Stata 7, and the STB***by*Patricia Branton**y:2001:v:10:i:59:dm83 Renaming variables: changing suffixes***by*Stephen P. Jenkins & Nicholas J. Cox**y:2001:v:10:i:59:dm84 labjl: Adding numerical codes to value labels***by*Jens M. Lauritsen**y:2001:v:10:i:59:dm85 listjl: List one variable in a condensed form***by*Jens M. Lauritsen**y:2001:v:10:i:59:dm86 Sampling without replacement: absolute sample sizes and keeping all observations***by*Nicholas J. Cox

### 2001, Volume 10, Issue 58

**y:2001:v:10:i:58:sts15.1 Tests for stationarity of a time series: update***by*Christopher F. Baum & Richard Sperling**y:2001:v:10:i:58:snp15.2 Update to Somersd***by*Roger Newson**y:2001:v:10:i:58:sg153 Censored least absolute deviations estimator: CLAD***by*Dean Jolliffe & Bohdan Krushelnytskyy & Anastassia Semykina**y:2001:v:10:i:58:sg154 Confidence intervals for the ratio of two binomial proportions by Koopman's method***by*Duolao Wang**y:2001:v:10:i:58:sg155 Tests for the multinomial logit model***by*Jeremy Freese & J. Scott Long**y:2001:v:10:i:58:sg156 Mean score method for missing covariate data in logistic regression models***by*Marie Reilly & Agus Salim**y:2001:v:10:i:58:sg157 Predicted values calculated from linear or logistic regression models***by*Joanne M. Garrett**y:2001:v:10:i:58:sbe19.3 Tests for publication bias in meta-analysis: erratum***by*Thomas J. Steichen**y:2001:v:10:i:58:sbe39.1 Nonparametric trim and fill analysis of publication bias in meta-analysis: erratum***by*Thomas J. Steichen**y:2001:v:10:i:58:dm65.1 Update to a program for saving a model fit as a dataset***by*Roger Newson**y:2001:v:10:i:58:sg84.3 Concordance correlation coefficient: minor corrections***by*Thomas J. Steichen & Nicholas J. Cox**y:2001:v:10:i:58:sg97.2 Update to formatting regression output***by*John Luke Gallup**y:2001:v:10:i:58:snp16 Robust confidence intervals for median and other percentile differences between two groups***by*Roger Newson**y:2001:v:10:i:58:gr45 A turnip graph engine***by*Steven Woloshin**y:2001:v:10:i:58:dm82 Simulating two- and three-generation families***by*Jisheng Cui**y:2001:v:10:i:58:sxd2 Computing optimal sampling designs for two-stage studies***by*Marie Reilly & Agus Salim**y:2001:v:10:i:58:sxd3 Sample size for the kappa-statistic of interrater agreement***by*Michael E. Reichenheim

### 2001, Volume 10, Issue 57

**y:2001:v:10:i:57:sg150 Hardy-Weinberg equilibrium test in case-control studies***by*Jisheng Cui**y:2001:v:10:i:57:sg151 B-splines and splines parameterized by their values at reference points on the x-axis***by*Roger Newson**y:2001:v:10:i:57:snp15.1 Update to somersd***by*Roger Newson**y:2001:v:10:i:57:sg152 Listing and interpreting transformed coefficients from certain regression models***by*J. Scott Long & Jeremy Freese**y:2001:v:10:i:57:sbe19.2 Update of tests for publication bias in meta-analysis***by*Thomas J. Steichen**y:2001:v:10:i:57:dm70.1 Extensions to generate, extended: corrections***by*Nicholas Cox**y:2001:v:10:i:57:dm80.1 Update to changing numeric variables to string***by*Nicholas J. Cox & Jeremy B. Wernow**y:2001:v:10:i:57:sts15 Tests for stationarity of a time series***by*Christopher F. Baum**y:2001:v:10:i:57:sts16 Tests for long memory in a time series***by*Christopher F. Baum & Vince Wiggins**y:2001:v:10:i:57:sts17 Compacting time series data***by*Christopher F. Baum**y:2001:v:10:i:57:sbe38 Haplotype frequency estimation using an EM algorithm and log-linearmodeling***by*Adrian Mander**y:2001:v:10:i:57:sbe39 Nonparametric trim and fill analysis of publication bias in meta-analysis***by*Thomas J. Steichen**y:2001:v:10:i:57:sbe40 Modeling mortality data using the Lee-Carter model***by*Duolao Wang**y:2001:v:10:i:57:dm81 Utility for time series data***by*Christopher F. Baum & Vince Wiggins

### 2001, Volume 10, Issue 56

**y:2001:v:10:i:56:sg143 Cronbach's alpha one-sided confidence interval***by*Maria-Jose Bleda & Aurelio Tobias**y:2001:v:10:i:56:sg144 Marginal effects of the tobit model***by*Ronna Cong**y:2001:v:10:i:56:sg145 Scalar measures of fit for regression models***by*J. Scott Long & Jeremy Freese**y:2001:v:10:i:56:sg146 Parameter estimation for the generalized extreme value distribution***by*Manuel G. Scotto & Aurelio Tobias**y:2001:v:10:i:56:sg147 Hill estimator for the index of regular variation***by*Manuel G. Scotto**y:2001:v:10:i:56:sg148 Profile likelihood confidence intervals for explanatory variables in logistic regression***by*Mark S. Pearce**y:2001:v:10:i:56:sg149 Tests for seasonal data via the Edwards and Walter & Elwood tests***by*Mark S. Pearce & Richard Feltbower**y:2001:v:10:i:56:sbe20.1 Update of galbr***by*Aurelio Tobias**y:2001:v:10:i:56:sbe26.1 Update of metainf***by*Aurelio Tobias**y:2001:v:10:i:56:sbe28.1 Update of metap***by*Aurelio Tobias**y:2001:v:10:i:56:sbe35 Menus for epidemiological statistics***by*John Carlin & Suzanna Vidmar**y:2001:v:10:i:56:sbe36 Summary statistics report for diagnostic tests***by*Aurelio Tobias**y:2001:v:10:i:56:sbe37 Special restrictions in multinomial logistic regression***by*John Hendrickx**y:2001:v:10:i:56:gr44 Graphing point estimate and confidence intervals***by*Richard F. MacLehose**y:2001:v:10:i:56:an73 Electronic version of the Stata Technical Bulletin is now available***by*Patricia Branton**y:2001:v:10:i:56:dm78 Describing variables in memory***by*Nicholas J. Cox**y:2001:v:10:i:56:dm79 Yet more new matrix commands***by*Nicholas J. Cox**y:2001:v:10:i:56:dm80 Changing numeric variables to string***by*Nicholas J. Cox & Jeremy B. Wernow

### 2001, Volume 10, Issue 55

**y:2001:v:10:i:55:sg135 Test for autoregressive conditional heteroskedasticity in regression error distribution***by*Christopher F. Baum & Vince Wiggins**y:2001:v:10:i:55:sg136 Tests for serial correlation in regression error distribution***by*Christopher F. Baum & Vince Wiggins**y:2001:v:10:i:55:sg137 Tests for heteroskedasticity in regression error distribution***by*Christopher F. Baum & Nicholas J. Cox & Vince Wiggins**y:2001:v:10:i:55:sg138 Bootstrap inferences about measures of correlation***by*Dan J. Neal**y:2001:v:10:i:55:sg139 Logistic regression when binary outcome is measured with uncertainty***by*Mario Cleves & Alberto Tossetto**y:2001:v:10:i:55:sg140 The Gumbel quantile plot and a test for choice of extreme models***by*Manuel G. Scotto**y:2001:v:10:i:55:sg141 Treatment effects model***by*Ronna Cong & David M. Drukker**y:2001:v:10:i:55:sg142 Uniform layer effect models for the analysis of differences in two-way associations***by*Maurizio Pisati**y:2001:v:10:i:55:sbe32.1 Errata for sbe32***by*López Vizcaíno**y:2001:v:10:i:55:snp15 somersd-Confidence intervals for nonparametric statistics and their differences***by*Roger Newson**y:2001:v:10:i:55:sbe33 Comparing several methods of measuring the same quantity***by*Paul Seed**y:2001:v:10:i:55:sbe34 Loglinear modeling using iterative proportional fitting***by*Adrian Mander**y:2001:v:10:i:55:an72 STB-49 - STB-54 available in bound format***by*Patricia Branton**y:2001:v:10:i:55:ip9.1 Update of the byvar command***by*Patrick Royston

### 2000, Volume 9, Issue 54

**y:2000:v:9:i:54:sg116.1 Update to hotdeck imputation***by*Adrian Mander & David Clayton**y:2000:v:9:i:54:sg120.2 Correction to roccomp command***by*Mario Cleves**y:2000:v:9:i:54:sg130 Box-Cox regression models***by*David M. Drukker**y:2000:v:9:i:54:sg131 On the manipulability of Wald tests in Box-Cox regression models***by*David M. Drukker**y:2000:v:9:i:54:sg132 Analysis of variance from summary statistics***by*John R. Gleason**y:2000:v:9:i:54:sg133 Sequential and drop one term likelihood-ratio tests***by*Zhiqiang Wang**y:2000:v:9:i:54:sg134 Model selection using the Akaike information criterion***by*Zhiqiang Wang**y:2000:v:9:i:54:ip29.1 Metadata for user-written contributions to the Stata programming language: extensions***by*Nicholas J. Cox & Christopher F. Baum**y:2000:v:9:i:54:gr34.3 An update to drawing Venn diagrams***by*Jens M. Lauritsen**y:2000:v:9:i:54:dm73.1 Contrasts for categorical variables: update***by*John Hendrickx**y:2000:v:9:i:54:sg84.2 Concordance correlation coefficient: update for Stata 6***by*Thomas J. Steichen & Nicholas J. Cox**y:2000:v:9:i:54:sxd1.2 Random allocation of treatments balanced in blocks: update***by*Philip Ryan**y:2000:v:9:i:54:sbe32 Automated outbreak detection from public health surveillance data***by*López Vizcaíno**y:2000:v:9:i:54:gr43 Overlaying graphs***by*Adrian Mander**y:2000:v:9:i:54:stata54 Multiple curves plotted with stcurv command***by*Mario Cleves**y:2000:v:9:i:54:stata55 Search web for installable packages***by*William Gould & Alan Riley**y:2000:v:9:i:54:dm76 ICD-9 diagnostic and procedure codes***by*William Gould**y:2000:v:9:i:54:dm77 Removing duplicate observations in a dataset***by*Duolao Wang

### 2000, Volume 9, Issue 53

**y:2000:v:9:i:53:sg120.1 Two new options added to rocfit command***by*Mario Cleves**y:2000:v:9:i:53:sg124 Interpreting logistic regression in all its forms***by*William Gould**y:2000:v:9:i:53:sg125 Automatic estimation of interaction effects and their confidence intervals***by*Jokin de Irala-Estévez & Miguel Angel Martínez**y:2000:v:9:i:53:sg126 Two-parameter log-gamma and log-inverse Gaussian models***by*Joseph Hilbe**y:2000:v:9:i:53:sg127 Summary statistics for estimation sample***by*Jeroen Weesie**y:2000:v:9:i:53:sg128 Some programs for growth estimation in fisheries biology***by*Isaías Hazarmabeth Salgado-Ugarte & José Luis Gómez-Márquez & FES Zaragoza**y:2000:v:9:i:53:sg129 Generalized linear latent and mixed models***by*Sophia Rabe-Hesketh & Andrew Pickles & Colin Taylor**y:2000:v:9:i:53:sg35.2 Robust tests for the equality of variances update to Stata 6***by*Mario Cleves**y:2000:v:9:i:53:dm63.1 A new version of winshow for Stata 6***by*Tony Brady**y:2000:v:9:i:53:dm75 Safe and easy matched merging***by*Jeroen Weesie

### 2000, Volume 9, Issue 52

**y:2000:v:9:i:52:sg119 Improved confidence intervals for binomial properties***by*John R. Gleason**y:2000:v:9:i:52:sg120 Receiver Operating Characteristic (ROC) anaylsis***by*Mario Cleves**y:2000:v:9:i:52:sg121 Seemlingly unrelated estimation and the cluster-adjusted sandwich estimator***by*Jeroen Weesie**y:2000:v:9:i:52:sg122 Truncated regression***by*Ronna Cong**y:2000:v:9:i:52:sg123 Hodges-Lehmann estimation of a shift in location between two populations***by*Duolao Wang**y:2000:v:9:i:52:ip18.1 Update to resample***by*John R. Gleason**y:2000:v:9:i:52:dm45.2 Changing string variables to numeric: correction***by*Nicholas J. Cox**y:2000:v:9:i:52:dm72.1 Alternative ranking procedures: update***by*Nicholas J. Cox**y:2000:v:9:i:52:ip29 Metadata for user-written contributions to the Stata programming language***by*Christopher F. Baum & Nicholas J. Cox**y:2000:v:9:i:52:sbe31 Exact confidence intervals for odds ratios from case-control studies***by*William D. Dupont & Dale Plummer**y:2000:v:9:i:52:dm73 Using categorical variables in Stata***by*John Hendrickx**y:2000:v:9:i:52:dm74 Changing the order of variables in a dataset***by*Jeroen Weesie

### 2000, Volume 9, Issue 51

**y:2000:v:9:i:51:sg115 Bootstrap standard errors for indices of inequality***by*Dean Jolliffe & Bohdan Krushelnytskyy**y:2000:v:9:i:51:sg116 Hotdeck imputation***by*Adrian Mander & David Clayton**y:2000:v:9:i:51:sg117 Robust standard errors for the Foster-Greer-Thorbecke class of poverty indices***by*Dean Jolliffe & Anastassia Semykina**y:2000:v:9:i:51:sg118 Partitions of Pearson's***by*Rory Wolfe**y:2000:v:9:i:51:dm50.1 Update to defv***by*John R. Gleason**y:2000:v:9:i:51:dm56.1 Update to labedit***by*John R. Gleason**y:2000:v:9:i:51:dm61.1 Update to varxplor***by*John R. Gleason**y:2000:v:9:i:51:dm66.2 Update of cut to Stata 6***by*David Clayton & Michael Hills**y:2000:v:9:i:51:sg67.1 Update to univar***by*John R. Gleason**y:2000:v:9:i:51:sts14 Bivariate Granger causality test***by*J. Sky David**y:2000:v:9:i:51:os15 Command-name registration at www.stata.com***by*William Gould & Alan Riley**y:2000:v:9:i:51:sbe30 Improved confidence intervals for odds ratios***by*John R. Gleason**y:2000:v:9:i:51:gr39 3D surface plots***by*Adrian Mander**y:2000:v:9:i:51:gr40 A simple contour plot***by*Adrian Mander**y:2000:v:9:i:51:gr41 Distribution function plots***by*Nicholas J. Cox**y:2000:v:9:i:51:gr42 Quantile plots, generalized***by*Nicholas J. Cox**y:2000:v:9:i:51:dm71 Calculating the product of observations***by*Philip Ryan**y:2000:v:9:i:51:dm72 Alternative ranking procedures***by*Nicholas J. Cox

### 2000, Volume 9, Issue 50

**y:2000:v:9:i:50:sg112.1 Nonlinear regression models involving power or exponential functions of covariates: update***by*Patrick Royston & Gareth Ambler**y:2000:v:9:i:50:sg113 Tabulation of modes***by*Nicholas J. Cox**y:2000:v:9:i:50:sg114 rglm - Robust variance estimates for generalized linear models***by*Roger Newson**y:2000:v:9:i:50:dm66.1 Stata 6 version of recoding variables using grouped values***by*David Clayton & Michael Hills (retired)**y:2000:v:9:i:50:sg81.2 Multivariable fractional polynomials: update***by*Patrick Royston & Gareth Ambler**y:2000:v:9:i:50:sxd1.1 Update to random allocation of treatments to blocks***by*Philip Ryan**y:2000:v:9:i:50:ip28 Automatically sorting by subgroup***by*Jeroen Weesie**y:2000:v:9:i:50:sbe29 Generalized linear models: extensions to the binomial family***by*James W. Hardin & Mario Cleves**y:2000:v:9:i:50:gr38 Enhancement to the hilite command***by*Jeroen Weesie**y:2000:v:9:i:50:stata53 censored option added to sts graph command***by*Mario Cleves**y:2000:v:9:i:50:dm68 Display of variables in blocks***by*Jeroen Weesie**y:2000:v:9:i:50:dm69 Further new matrix commands***by*Nicholas J. Cox**y:2000:v:9:i:50:dm70 Extensions to generate, extended***by*Nicholas J. Cox

### 2000, Volume 9, Issue 49

**y:2000:v:9:i:49:sg107.1 Generalized Lorenz curves and related graphs***by*Stephen P. Jenkins & Philippe Van Kerm**y:2000:v:9:i:49:sg111 A modified likelihood-ratio test command***by*Santiago Perez-Hoyos & Aurelio Tobias**y:2000:v:9:i:49:sg112 Nonlinear regression models involving power or exponential functions of covariates***by*Patrick Royston & Gareth Ambler**y:2000:v:9:i:49:gr34.2 Drawing Venn diagrams***by*Jens M. Lauritsen**y:2000:v:9:i:49:dm45.1 Changing string variables to numeric: update***by*Nicholas J. Cox**y:2000:v:9:i:49:sg64.1 Update to pwcorrs***by*Fred Wolfe**y:2000:v:9:i:49:sg81.1 Multivariable fractional polynomials: update***by*Patrick Royston & Gareth Ambler**y:2000:v:9:i:49:sg97.1 Revision of outreg***by*John Luke Gallup**y:2000:v:9:i:49:ssa13 Analysis of multiple failure-time data with Stata***by*Mario Cleves**y:2000:v:9:i:49:sbe27 Assessing confounding effects in epidemiological studies***by*Zhiqiang Wang**y:2000:v:9:i:49:sbe28 Meta-analysis of p-values***by*Aurelio Tobias**y:2000:v:9:i:49:gr36 An extension of for, useful for graphics commands***by*Jeroen Weesie**y:2000:v:9:i:49:gr37 Cumulative distribution function plots***by*David Clayton & Michael Hills**y:2000:v:9:i:49:dm65 A program for saving a model fit as a dataset***by*Roger Newson**y:2000:v:9:i:49:dm66 Recoding variables using grouped values***by*David Clayton & Michael Hills**y:2000:v:9:i:49:dm67 Numbers of missing and present values***by*Nicholas J. Cox**y:2000:v:9:i:49:an69 STB-43 through STB-48 available in bound format***by*Patricia Branton

### 1999, Volume 8, Issue 48

**y:1999:v:8:i:48:sg104 Analysis of income distributions***by*Stephen P. Jenkins**y:1999:v:8:i:48:sg105 Creation of bivariate random lognormal variables***by*Stephen P. Jenkins**y:1999:v:8:i:48:sg106 Fitting Singh-Maddala and Dagum distributions by maximum likelihood***by*Stephen P. Jenkins**y:1999:v:8:i:48:sg107 Generalized Lorenz curves and related graphs***by*Stephen P. Jenkins & Philippe Van Kerm**y:1999:v:8:i:48:sg108 Computing poverty indices***by*Philippe Van Kerm**y:1999:v:8:i:48:sg109 Utility to convert binomial frequency records to frequency weighted data***by*Mario Cleves**y:1999:v:8:i:48:sg110 Hardy-Weinberg equilibrium test and allele frequency estimation***by*Mario Cleves**y:1999:v:8:i:48:gr34.1 Drawing Venn diagrams***by*Jens M. Lauritsen**y:1999:v:8:i:48:gr35 Diagnostic plots for assessing Singh-Maddala and Dagum distributions fitted by MLE***by*Nicholas J. Cox