# 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)**

**Series handle:**repec:tsj:stbull

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### 1996, Volume 5, Issue 29

**y:1996:v:5:i:29:dm40 Converting string variables to numeric variables***by*Robert M. Farmer**y:1996:v:5:i:29:sg46 Huber correction for two-stage least squares estimates***by*Mead Over & Dean Jolliffe & Andrew Foster**y:1996:v:5:i:29:sg47 A plot and a test for the***by*Patrick Royston**y:1996:v:5:i:29:sg48 Making predictions in the original metric for log-transformed models***by*Richard Goldstein**y:1996:v:5:i:29:an57 Stata is on the Web***by*Chinh Nguyen**y:1996:v:5:i:29:snp9 Kornbrot's rank difference test***by*Richard Goldstein

### 1996, Volume 5, Issue 28

**y:1996:v:5:i:28:ip10 Finding an observation number***by*Sean Becketti**y:1996:v:5:i:28:sbe12 Using lfit and lroc to evaluate mortality prediction models***by*John M. Tilford & Paula K. Roberson & Debra H. Fiser**y:1996:v:5:i:28:dm35 A utility for surveying Stata-format data sets***by*Timothy J. Schmidt**y:1996:v:5:i:28:dm36 Comparing two Stata data sets***by*John R. Gleason**y:1996:v:5:i:28:sg43 Modified***by*Richard Goldstein**y:1996:v:5:i:28:sg44 Random number generators***by*Joseph Hilbe & Walter Linde-Zwirble**y:1996:v:5:i:28:sg45 Maximum-likelihood ridge regression***by*Robert L. Obenchain

### 1996, Volume 5, Issue 27

**y:1996:v:5:i:27:an55 New Stata for Macintosh released***by*William Gould & Chinh Nguyen**y:1996:v:5:i:27:an56 Stata for Windows 95 and Stata for WindowsNT released***by*William Gould & Alan Riley**y:1996:v:5:i:27:snp6.2 Practical rules for bandwidth selection in univariate density estimation***by*Isaias Hazarmabeth Salgado-Ugarte & Makoto Shimizu & Toru Taniuchi**y:1996:v:5:i:27:ssa7 Analysis of follow-up studies***by*David Clayton & Michael Hills**y:1996:v:5:i:27:ssa8 Analysis of case-control and prevalence studies***by*David Clayton & Michael Hills**y:1996:v:5:i:27:ip9 Repeat Stata command by variable(s)***by*Patrick Royston

### 1996, Volume 5, Issue 26

**y:1996:v:5:i:26:sg35.1 Robust tests for the equality of variances: correction***by*Mario A. Cleves**y:1996:v:5:i:26:sg37.1 Orthogonal polynomials: correction***by*William M. Sribney**y:1996:v:5:i:26:dm31 Counting missing values an extension to egen***by*Richard Goldstein**y:1996:v:5:i:26:dm32 Matching names in Stata***by*Peter Sasieni**y:1996:v:5:i:26:dm33 Elapsed days using 30-day months***by*Ken Heinecke**y:1996:v:5:i:26:dm34 Constructing axis labels for dates***by*Sean Becketti**y:1996:v:5:i:26:sg40 Testing for the mean of a skewed variable***by*Richard Goldstein**y:1996:v:5:i:26:sg41 Random-effects probit***by*William M. Sribney**y:1996:v:5:i:26:sg42 Plotting predicted values from linear and logistic regression models***by*Joanne Garrett**y:1996:v:5:i:26:snp6.1 ASH, WARPing, and kernel density estimation for univariate data***by*Isaias Hazarmabeth Salgado-Ugarte & Makoto Shimizu & Toru Taniuchi**y:1996:v:5:i:26:snp8.1 Robust scatterplot smoothing: correction***by*Sean Becketti**y:1996:v:5:i:26:ip8 An enhanced for command***by*Patrick Royston

### 1996, Volume 5, Issue 25

**y:1996:v:5:i:25:sg26.3 Fractional polynomial utilities***by*Patrick Royston**y:1996:v:5:i:25:sg32.1 Variance inflation factors and variance-decomposition proportions: Correction***by*James W. Hardin**y:1996:v:5:i:25:sts10 Prais-Winsten regression***by*James W. Hardin**y:1996:v:5:i:25:dm28 Calculate nice numbers for labeling or drawing grid lines***by*James W. Hardin**y:1996:v:5:i:25:dm29 Create TeX tables from data***by*James W. Hardin**y:1996:v:5:i:25:dm30 Comparing observations within a data file***by*Richard Goldstein**y:1996:v:5:i:25:sg35 Robust tests for the equality of variances***by*Mario A. Cleves**y:1996:v:5:i:25:sg36 Tabulating the counts of multiple categorical variables***by*Peter Sasieni**y:1996:v:5:i:25:sg37 Orthogonal polynomials***by*William M. Sribney**y:1996:v:5:i:25:sg38 Generating quantiles***by*William M. Sribney**y:1996:v:5:i:25:sg39 Independent percentages in tables***by*Benjamin Miller**y:1996:v:5:i:25:an54 STB-19 through STB-24 available in bound format***by*Sean Becketti**y:1996:v:5:i:25:snp8 Robust scatterplot smoothing: enhancements to Stata's ksm***by*Isaias Hazarmabeth Salgado-Ugarte & Makoto Shimizu

### 1995, Volume 4, Issue 24

**y:1995:v:4:i:24:sg21.1 Equivalency testing: Correction***by*Richard Goldstein**y:1995:v:4:i:24:sg26.2 Calculating and graphing fractional polynomials***by*Sean Becketti**y:1995:v:4:i:24:gr17 Switching graphics windows in Unix***by*Peter Sasieni**y:1995:v:4:i:24:dm25 Recoding in steps***by*Sean Becketti**y:1995:v:4:i:24:dm26 Labeling graphs with date formats***by*Alan Riley**y:1995:v:4:i:24:dm27 An improved collapse, with weights***by*William Gould**y:1995:v:4:i:24:sg32 Variance inflation factors and variance-decomposition proportions***by*James W. Hardin**y:1995:v:4:i:24:sg33 Calculation of adjusted means and adjusted proportions***by*Joanne Garrett**y:1995:v:4:i:24:sg34 Jackknife estimation***by*William Gould**y:1995:v:4:i:24:ssi5.4 Correction to error term in Ridders' method***by*Alan Riley**y:1995:v:4:i:24:ip6.2 Storing matrices as variables***by*William M. Sribney**y:1995:v:4:i:24:snp7.1 Natural cubic splines: Correction***by*Peter Sasieni**y:1995:v:4:i:24:sts7.6 A library of time series programs for Stata (Update)***by*Sean Becketti**y:1995:v:4:i:24:sed9 Symmetric nearest neighbor linear smoothers***by*Peter Sasieni

### 1995, Volume 4, Issue 23

**y:1995:v:4:i:23:sqv10 Expanded multinomial comparisons***by*William H. Rogers**y:1995:v:4:i:23:os15 The impact of the Pentium FDIV bug on Stata users***by*William Gould**y:1995:v:4:i:23:gr16 Convex hull programs***by*J. Patrick Gray & Tim McGuire**y:1995:v:4:i:23:dm24 Producing formatted tables***by*William H. Rogers**y:1995:v:4:i:23:sg29 Tabulation of observed/expected rations and confidence intervals***by*Peter Sasieni**y:1995:v:4:i:23:sg30 Measures of inequality in Stata***by*Edward Whitehouse**y:1995:v:4:i:23:sg31 Measures of Diversity: Absolute and Relative***by*Richard Goldstein**y:1995:v:4:i:23:zz3.7 Computerized index for the STB replaced in Stata 4.0***by*William Gould**y:1995:v:4:i:23:an51 Call for suggestions***by*Sean Becketti**y:1995:v:4:i:23:an52 Stata 4.0 released***by*Patricia Branton**y:1995:v:4:i:23:an53 Implications of Stata 4.0 for the STB***by*Sean Becketti**y:1995:v:4:i:23:sts7.5 A library of time series programs for Stata (Update)***by*Sean Becketti**y:1995:v:4:i:23:ip7 A utility for debugging Stata programs***by*Timothy J. Schmidt

### 1995, Volume 4, Issue 22

**y:1995:v:4:i:22:sg26.1 Fractional polynomials: Correction***by*Patrick Royston & Douglas G. Altman**y:1995:v:4:i:22:sss1.1 Updated U.S. marginal income tax rate function***by*Timothy J. Schmidt**y:1995:v:4:i:22:dm21 Bringing large data sets into memory***by*Robert M. Farmer**y:1995:v:4:i:22:dm22 Sorting in descending order***by*David Mabb**y:1995:v:4:i:22:dm23 Saving a subset of the current data set***by*David Mabb**y:1995:v:4:i:22:sg27 The overlapping coefficient and an “improved” rank-sum statistic***by*Richard Goldstein**y:1995:v:4:i:22:sg28 Multiple comparisons of categories after regression-like methods***by*William H. Rogers**y:1995:v:4:i:22:an50 Submission guidelines***by*Sean Becketti**y:1995:v:4:i:22:sts7.4 A library of time series programs for Stata***by*Sean Becketti & William Gould**y:1995:v:4:i:22:dt2 Reading public user microdata samples into Stata***by*Charles L. Sigmund & D.H. Judson**y:1995:v:4:i:22:ssa6 Utilities for survival analysis with time-varying regressors***by*Dr. Philippe Bocquier**y:1995:v:4:i:22:snp7 Natural cubic splines***by*Peter Sasieni

### 1995, Volume 4, Issue 21

**y:1995:v:4:i:21:sbe11 Direct Standardization***by*Tim McGuire & Joel A. Harrison**y:1995:v:4:i:21:sg26 Using fractional polynomials to model curved regression relationships***by*Patrick Royston & Douglas G. Altman**y:1995:v:4:i:21:zz3.5 Computerized index for the STB (Update)***by*William Gould**y:1995:v:4:i:21:an47 New associate editors***by*Sean Becketti**y:1995:v:4:i:21:an48 Updated CPS labor extracts available***by*Daniel Feenberg**y:1995:v:4:i:21:an49 Stata listserver available***by*David W. Wormuth**y:1995:v:4:i:21:ssi6.2 Faster and easier bootstrap estimation***by*William Gould**y:1995:v:4:i:21:sed8 Finding significant gaps in univariate distributions***by*Richard Goldstein**y:1995:v:4:i:21:sts9 Johansen's test for cointegration***by*Ken Heinecke & Charles Morris

### 1995, Volume 4, Issue 20

**y:1995:v:4:i:20:an44.1 StataQuest disk enclosed (realy)***by*Patricia Branton**y:1995:v:4:i:20:os14 A program to format raw data files***by*Phillip Swagel**y:1995:v:4:i:20:dm19 Merging raw data and dictionary files***by*Jonathon Nash**y:1995:v:4:i:20:dm20 Date functions***by*Alan Riley**y:1995:v:4:i:20:sg25 Interaction expansion***by*William Gould**y:1995:v:4:i:20:zz3.4 Computerized index for the STB (Update)***by*William Gould**y:1995:v:4:i:20:an46 Stata and Stage now available for IBM PowerPC***by*Tim McGuire**y:1995:v:4:i:20:ip6.1 Data and matrices***by*William Gould**y:1995:v:4:i:20:ssi6.1 Simplified Monte Carlo simulations***by*William Gould**y:1995:v:4:i:20:sts7.3 A library of time series programs for Stata***by*Sean Becketti & Ken Heinecke & Charles Morris**y:1995:v:4:i:20:ip6 Storing variables in vectors and matrices***by*Ken Heinecke**y:1995:v:4:i:20:ssi6 Routines to speed Monte Carlo experiments***by*William Gould

### 1995, Volume 4, Issue 19

**y:1995:v:4:i:19:sg22.3 Generalized linear models: revision of glm. (Rejoinder)***by*Patrick Royston**y:1995:v:4:i:19:os12 Windowed interfaces for Stata***by*William Gould**y:1995:v:4:i:19:os13 Using awk and fgrep for selective extraction from Stata log files***by*Nicholas J. Cox**y:1995:v:4:i:19:gr14 dotploy: Comparitive scatterplots***by*Peter Sasieni & br>Patrick Royston**y:1995:v:4:i:19:gr15 Incorporating Stata graphs in TeX documents using an HP printer***by*Sean Becketti**y:1995:v:4:i:19:dm17 Conversions for international date formats***by*Philip Ryan**y:1995:v:4:i:19:dm18 Adding trailing moving averages to the egen command***by*Sean Becketti**y:1995:v:4:i:19:zz3.3 Computerized index for the STB (Update)***by*William Gould**y:1995:v:4:i:19:an42 STB-13 through STB-18 available in bound format***by*Sean Becketti**y:1995:v:4:i:19:an43 New address for STB office***by*Sean Becketti**y:1995:v:4:i:19:an44 StataQuest, Stata for teaching***by*Stan Loll**y:1995:v:4:i:19:an45 Stata and Stage now available for DEC Alpha***by*Tim McGuire**y:1995:v:4:i:19:ssi5.3 Correction to Ridders' method***by*Tim McGuire**y:1995:v:4:i:19:sts7.2 A library of time series programs for Stata (Update)***by*Sean Becketti**y:1995:v:4:i:19:ssa3 Adjusted survival curves***by*William H. Rogers**y:1995:v:4:i:19:ssa4 Ex post tests and diagnostics for a proportional hazards model***by*William H. Rogers**y:1995:v:4:i:19:ssa5 Note on time intervals in time-varying Cox regression***by*William H. Rogers**y:1995:v:4:i:19:sqv9 Probit coefficients as changes in probabilities***by*William Gould

### 1994, Volume 3, Issue 18

**y:1994:v:3:i:18:sg16.5 Negative binomial regression***by*Joseph Hilbe**y:1994:v:3:i:18:sg22.1 Comment on Royston's revision of glm***by*Joseph Hilbe**y:1994:v:3:i:18:sg22.2 Certifications of glm***by*William Gould**y:1994:v:3:i:18:sg22 Generalized linear models: revision of glm***by*Patrick Royston**y:1994:v:3:i:18:sg23 Semi-graphical determination of Gaussian components in mixed distributions***by*Isaias Hazarmabeth Salgado-Ugarte & Makoto Shimizu & Toru Taniuchi**y:1994:v:3:i:18:sg24 The piecewise linear spline transformation***by*Constantijn Panis**y:1994:v:3:i:18:zz3.1 Computerized index for the STB***by*William Gould**y:1994:v:3:i:18:an41 STB office moving***by*Sean Becketti**y:1994:v:3:i:18:sts7.1 A library of time series programs for Stata (Update)***by*Sean Becketti

### 1994, Volume 3, Issue 17

**y:1994:v:3:i:17:dm16 Compact listing of a single variable***by*Patrick Royston & Peter Sasieni**y:1994:v:3:i:17:sg20 Point biserial correlation***by*John A. Anderson**y:1994:v:3:i:17:sg21 Equivalency testing***by*Richard Goldstein**y:1994:v:3:i:17:zz3.1 Computerized index for the STB***by*William Gould**y:1994:v:3:i:17:os5.1 Running Intercooled Stata under OS/2 2.1***by*William Gould**y:1994:v:3:i:17:ssi5.2 Equation solving by Ridders' method***by*Tim McGuire**y:1994:v:3:i:17:sqc1 Estimating process capability indices with Stata***by*Sutaip L. C. Saw & Teck Wong Soon**y:1994:v:3:i:17:ip5 A temporary solution to a problem with temporary variable names***by*Craig S. Hakkio**y:1994:v:3:i:17:sts5 Detrending with the Hodrick-Prescott filter***by*Timothy J. Schmidt**y:1994:v:3:i:17:sts6 Approximate p-values for unit root and cointegration tests***by*Craig S. Hakkio**y:1994:v:3:i:17:sts7 A library of time series programs for Stata***by*Sean Becketti

### 1994, Volume 3, Issue 16

**y:1994:v:3:i:16:sg16.3 Quasi-likelihood modeling using an enhanced glm command***by*Joseph Hilbe**y:1994:v:3:i:16:sg16.4 Comparison of nbreg and glm for negative binomial***by*William H. Rogers**y:1994:v:3:i:16:dm15 Interactively list values of variables***by*Alan Riley**y:1994:v:3:i:16:an37 Stata classes and programming services available***by*Eric Best**y:1994:v:3:i:16:sts4.1 More on time series regression***by*Dean Becketti**y:1994:v:3:i:16:ssi5.1 Graphing functions***by*William Gould**y:1994:v:3:i:16:zz3 Computerized index for the STB***by*William Gould**y:1994:v:3:i:16:ssi5 Equation solving by bisection***by*William Gould**y:1994:v:3:i:16:snp6 Exploring the shape of univariate data using kernel density estimators***by*Isaias Hazarmabeth Salgado-Ugarte & Makoto Shimizu & Toru Taniuchi

### 1994, Volume 3, Issue 15

**y:1994:v:3:i:15:gr13.1 \special{} effects with Stata graphs in TeX documents***by*William Gould**y:1994:v:3:i:15:gr13 Incorporating Stat-created PostScript files into TeX/LaTeX documents***by*Teck-Wong Soon & Sutaip L. C. Saw**y:1994:v:3:i:15:an36 Stata 3.0 users beware!***by*Sean Becketti**y:1994:v:3:i:15:dt1 Five data sets for teaching***by*J. Theodore Anagnoson**y:1994:v:3:i:15:sss1 Calculating U.S. marginal income tax rates***by*Timothy J. Schmidt**y:1994:v:3:i:15:sts4 A suite of programs for time series regression***by*Sean Becketti

### 1994, Volume 3, Issue 14

**y:1994:v:3:i:14:dm14.1 Converting Stata elapsed dates to Julian dates***by*Sean Becketti**y:1994:v:3:i:14:sg16.2 GLM: A unified power-link based program including the negative binomial***by*Joseph Hilbe**y:1994:v:3:i:14:os10 A method for taking notes during a Stata session***by*Bill Rising**y:1994:v:3:i:14:os11 A poor-man's 'windowing' environment for Stata***by*Paul Geiger**y:1994:v:3:i:14:dm14 Converting Julian dates to Stata elapsed dates***by*Charles Chapin**y:1994:v:3:i:14:sg18 An improved R^2***by*Patrick Royston & Richard Goldstein**y:1994:v:3:i:14:an34 Stata 3.1 is available now***by*Patricia Branton**y:1994:v:3:i:14:an35 A first look at Stata 3.1***by*Sean Becketti**y:1994:v:3:i:14:cc1 Stata chosen for the Medicare program***by*Charles Chapin**y:1994:v:3:i:14:ssi4 Confidence intervals in logit and probit models***by*William Gould**y:1994:v:3:i:14:qs5 How to create stacked bar charts of percentages***by*Felicia Knaul**y:1994:v:3:i:14:snp5 The run test for random order***by*Sean Becketti**y:1994:v:3:i:14:qs6 Query for chemists, physiologists, and pharmacologists***by*Paul Geiger**y:1994:v:3:i:14:qs7 Maximum-likelihood estimation of Gaussian mixtures***by*Isaias Hazarmabeth Salgado-Ugarte

### 1994, Volume 3, Issue 13

**y:1994:v:3:i:13:sg11.2 Calculation of quantile regression standard errors***by*William Rogers**y:1994:v:3:i:13:dm12.1 Selecting claims from medical claims data bases***by*Robert J. Vaughn**y:1994:v:3:i:13:dm13.1 String manipulation functions***by*William Gould**y:1994:v:3:i:13:dm13 Person name extraction***by*William Gould**y:1994:v:3:i:13:sg17 Regression standard errors in clustered samples***by*William Rogers**y:1994:v:3:i:13:an31 Statement from the new editor***by*Sean Becketti**y:1994:v:3:i:13:an32 Stata Technical Bulletin 7 through Stata Technical Bulletin 12 available in bound format***by*Sean Becketti**y:1994:v:3:i:13:sg5.1 Correlation coefficients with significance levels***by*Sean Becketti**y:1994:v:3:i:13:sts3 Cross correlations***by*Sean Becketti**y:1994:v:3:i:13:ip4 Program debugging command***by*Sean Becketti**y:1994:v:3:i:13:os8 Stata and Lotus 1-2-3***by*Patrick Royston & William Gould**y:1994:v:3:i:13:sqv8 Interpreting multinomial logistic regression***by*Lawrence C. Hamilton & Carole L. Seyfrit**y:1994:v:3:i:13:os9 Printing Stata log files***by*Sean Becketti

### 1993, Volume 2, Issue 12

**y:1993:v:2:i:12:sg16.1 Generalized linear models using power links***by*Joseph Hilbe**y:1993:v:2:i:12:dm11 Matching the Current Population Surveys***by*Finis Welch**y:1993:v:2:i:12:dm12 Selecting claims from medical claims data bases***by*Robert J. Vaughn**y:1993:v:2:i:12:gr12 Graphs of means and medians by categorical variables***by*William Gould**y:1993:v:2:i:12:sg1.5 Standard nonlinear curve fits update***by*Patrick Royston**y:1993:v:2:i:12:sbe2.1 Bailey-Makeham survival models***by*William Rogers**y:1993:v:2:i:12:sbe2.2 Faster hpredict.exe***by*Henry Krakauer**y:1993:v:2:i:12:an29 New edition of Statistics with Stata published***by*Ted Anderson**y:1993:v:2:i:12:an30 Editorship turnover***by*Joseph Hilbe**y:1993:v:2:i:12:gr3.1 Crude 3-dimensional graphics revisited***by*William Gould**y:1993:v:2:i:12:tt6.1 Courseware guidelines***by*William Gould & William Rogers**y:1993:v:2:i:12:tt6.2 Duxbury Press looking for courseware authors***by*Stan Loll**y:1993:v:2:i:12:tt6 Courseware***by*William Gould & William Rogers**y:1993:v:2:i:12:sqv7 Cusum plots and tests for binary variables***by*Patrick Royston

### 1993, Volume 2, Issue 11

**y:1993:v:2:i:11:sbe10 An improvement to poisson***by*German Rodriguez**y:1993:v:2:i:11:sg15 Sample size determination for means and proportions***by*Joseph Hilbe