# Boston College Department of Economics

# Statistical Software Components

Postal: Boston College, 140 Commonwealth Avenue, Chestnut Hill MA 02467 USA

Phone: 617-552-3670

Fax: +1-617-552-2308

Web page: http://fmwww.bc.edu/EC/

Email:

More information through EDIRC

Phone: 617-552-3670

Fax: +1-617-552-2308

Web page: http://fmwww.bc.edu/EC/

Email:

More information through EDIRC

**Order information:**

Web: http://repec.org/docs/ssc.php

**Editor:**

Additional information is available for the following
registered editor(s): Christopher F Baum
**For corrections or technical questions regarding this series, please contact
(Christopher F Baum)**

**Series handle:**repec:boc:bocode

**Citations RSS feed:**at CitEc

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### 2014

**ZICEN: Stata module to estimate a finite mixture model of a degenerate distribution with mass at zero and one or two censored (Tobit) normals***by*Marcelo Coca Perraillon**DISCREPANCY: Stata module to implement a pseudo-ANOVA method for partitions of pairwise distance matrices***by*Brendan Halpin**COMBOMARGINSPLOT: Stata module to combine the saved results from multiple calls to margins into one marginsplot***by*Nick Winter**CIBAR: Stata module to plot bar graphs and confidence intervals over groups***by*Alexander Staudt**MDEPRIV: Stata module to compute synthetic indicators of multiple deprivation***by*Maria Noel Pi Alperin & Philippe Van Kerm**WDISCRIM: Stata module to compute earnings discrimination statistics***by*Philippe Van Kerm**VSELECT: Stata module to perform linear regression variable selection***by*Charles Lindsey**TFV: Stata module to produce transformations of variables***by*Daniel Klein**DQD: Stata module to compute treatment effects under alternative Parallel-q assumptions***by*Ricardo Mora & Iliana Reggio**CODEBOOKOUT: Stata module to save codebook in MS excel format***by*Kishor K. Das**PINDEX: Stata module to compute targeted price indices***by*Muhammad Rashid Ansari & Chiara Mussida**TREATOPROBIT: Stata module to estimate a treatment effects model for a binary endogenous treatment on an ordered outcome***by*Christian Gregory**B1X2: Stata module to account for changes when X2 is added to a base model with X1***by*Jonah Gelbach**FASTSAMPLE: Stata module to quickly draw random sample***by*Andrew Maurer**GVSELECT: Stata module to perform best subsets variable selection***by*Charles Lindsey & Simon Sheather**GLMDECO: Stata module to compute Detailed Decomposition of Average Outcome Differentials in Generalized Linear Models***by*Boris Kaiser**TEX3PT: Stata module to produce LaTeX documents from estout with threeparttable***by*Derek Wolfson**CROSSPLOT: Stata module for scatter (or other twoway) plots for each y vs each x variable***by*Nicholas J. Cox**CTREATREG: Stata module for estimating dose-response models under exogenous and endogenous treatment***by*Giovanni Cerulli**UNEMP: Stata module module to compute aggregate households employment deprivation (or unemployment) measures***by*Carlos Gradin**MIPARALLEL: Stata module to perform parallel estimation for multiple imputed datasets***by*Timothy Mak**COMBINEPLOT: Stata module to combine similar univariate or bivariate plots for different variables***by*Nicholas J. Cox**SPECHIST: Stata module to produce specific histograms for continuous variables***by*Alfonso Sanchez-Penalver**PVW: Stata module to perform predictive value weighting for covariate misclassification in logistic regression***by*Jonathan Bartlett**TESTCASE: Stata module to provide a code-testing framework for Mata***by*James Fiedler**SMCL2DO: Stata module to convert log files to do-files in a robust fashion***by*Bill Rising**MIINC: Stata module to conduct multi-model inference using information criteria***by*Joseph N. Luchman**SEPSCATTER: Stata module to draw scatter (or other twoway) plots separated by a third variable***by*Nicholas J. Cox**NPSERIES: Stata module to perform Nonparametric Power Series Estimation***by*Boris Kaiser**QV: Stata module to compute quasi-variances***by*Aspen Chen**PLAUSEXOG: Stata module to implement Conley et al's plausibly exogenous bounds***by*Damian Clarke**LMHCW: Stata Module to Compute OLS Heteroscedasticity Cook-Weisberg Test***by*Emad Abd Elmessih Shehata & Sahra Khaleel A. Mickaiel**LMHHP: Stata Module to Compute OLS Heteroscedasticity Hall-Pagan Test***by*Emad Abd Elmessih Shehata & Sahra Khaleel A. Mickaiel**LMNAD: Stata Module to Compute OLS Non Normality Anderson-Darling Test***by*Emad Abd Elmessih Shehata & Sahra Khaleel A. Mickaiel**LMNDH: Stata Module to Compute OLS Non Normality Doornik-Hansen Test***by*Emad Abd Elmessih Shehata & Sahra Khaleel A. Mickaiel**LMABG: Stata Module to compute OLS Autocorrelation Breusch-Godfrey Test at Higher Order AR(p)***by*Emad Abd Elmessih Shehata & Sahra Khaleel A. Mickaiel**DESIGNPLOT: Stata module to produce a graphical summary of response given one or more factors***by*Nicholas J. Cox**DSEG: Stata module to compute decomposable multigroup segregation indexes***by*Ricardo Mora**IVCHECK: Stata module to choose between OLS and contaminated IV***by*Anirban Basu**IVREG2HDFE: Stata module to estimate an Instrumental Variable Linear Regression Model with two High Dimensional Fixed Effects***by*Dany Bahar**REGWLS: Stata module to estimate Weighted Least Squares with factor variables***by*Dany Bahar**MYCD10: Stata module to process ICD-10 diagnosis and procedure codes***by*Joe Canner**D3NETWORK: Stata module to create network visualizations using D3.js to view in browser***by*Sebastian Pink & Sabrina Vogel**STMIXED: Stata module to fit multilevel mixed effects parametric survival models***by*Michael J. Crowther**RENVARLAB: Stata module to rename variables, with option of using variable labels to create new variable names***by*Joe Canner**PROSPERITY: Stata module to compute Shared Prosperity Convergence Index***by*Oscar Barriga Cabanillas**XTCSI: Stata module to investigate Residual Cross-Section Independence***by*Maximo Sangiacomo**POLAR: Stata module to plot polar coordinates***by*Joe Canner**XTCIPS: Stata module to compute Pesaran Panel Unit Root Test in the Presence of Cross-section Dependence***by*Maximo Sangiacomo**MORE_CLARIFY: Stata module to estimate quantities of interest through simulation and resampling methods***by*Javier Marquez Pena**GROUPLABS: Stata module to create value labels for grouped variables***by*Sergiy Radyakin**BAPLOT: Stata module to produce Bland-Altman plots***by*Paul Seed**JAROWINKLER: Stata module to calculate the Jaro-Winkler distance between strings***by*James Feigenbaum**REGEN: Stata module to create new or change existing variable***by*Daniel Klein**NPINFO: Stata module to merge network-based nodal characteristics***by*Sebastian Pink & Sabrina Vogel**LDTEST: Stata module to compute Lorenz Dominance tests***by*Garry Barrett & Stephen Donald**MQGAMMA: Stata module to estimate quantiles of potential-outcome distributions***by*David M. Drukker**ALIGNMICRO: Stata module to perform alignment in microsimulation***by*Jinjing Li**QQPLOT3: Stata module to plot the unweighted and weighted quantiles of one variable against the corresponding quantiles of another***by*Ariel Linden**KEEPORDER: Stata module to keep and order a set of variables***by*James Feigenbaum**TEX2COL: Stata module to Split Text into Columns***by*Santiago Garriga**METAPROP_ONE: Stata module to perform fixed and random effects meta-analysis of proportions***by*Victoria Nyawira Nyaga & Marc Arbyn & Marc Aerts**KALPHA: Stata module to compute Krippendorff's Alpha-Reliability***by*Daniel Klein**QUINE: Stata module providing a self-producing program***by*Matthew Baker**EXCELCOL: Stata module to convert a column index into a name of an Excel column***by*Sergiy Radyakin**BSENS: Stata module to compute Sensitivity metric using McNemar's test***by*Hemang C Subramanian & Eric Overby**MBSENS: Stata module to compute Sensitivity metric for matched sample using McNemar's test***by*Hemang C Subramanian & Eric Overby**MARKDOC: Stata module to convert SMCL logfiles to Markdown format***by*E.F. Haghish**KERNEL: Stata module to compute various kernels***by*Florian Chavez Juarez**KWSTAT: Stata module to compute kernel weighted sample statistics***by*Florian Chavez Juarez**ALIGNEDRANKS: Stata module to perform a two-sample aligned rank-sum (Hodges-Lehmann) test with exact statistics for small samples***by*Ariel Linden**ZIPFFIT: Stata module to fit the Zipf distribution or the Zipf-Mandelbrot distribution by maximum likelihood***by*Alexander Koplenig**SAVESPSS: Stata module to save data to SPSS (.sav) system file***by*Sergiy Radyakin**REGHDFE: Stata module to perform linear or instrumental-variable regression absorbing any number of high-dimensional fixed effects***by*Sergio Correia**GROUP_TWOWAY: Stata module to group observations by the connected components of two variables***by*Lucas Ferreira Mation & Aguinaldo Nogueira Maciente**TEX_EQUAL: Stata module to compare text files***by*Santiago Garriga**XTINE: Stata module to calculate percentile and quantile for a numeric variable***by*Christine Cook**WEAVER: Stata module to produce dynamic reports in HTML and PDF***by*E.F. Haghish**EMAILME: Stata module to facilitate sending mail on Windows systems***by*Ed Gerrish**LMABG2: Stata Module to Compute 2SLS-IV Autocorrelation Breusch-Godfrey Test at Higher Order AR(p)***by*Emad Abd Elmessih Shehata & Sahra Khaleel A. Mickaiel**LMABP2: Stata module to compute 2SLS-IV Box-Pierce Autocorrelation LM Test at Higher Order AR(p)***by*Sahra Khaleel A. Mickaiel & Emad Abd Elmessih Shehata**LMHHP2: Stata Module to Compute 2SLS-IV Heteroscedasticity Hall-Pagan Test***by*Emad Abd Elmessih Shehata & Sahra Khaleel A. Mickaiel**LMHMSS2: Stata Module to Compute 2SLS-IV Heteroscedasticity Machado-Santos-Silva Test***by*Sahra Khaleel A. Mickaiel & Emad Abd Elmessih Shehata & Sahra Khaleel A. Mickaiel**LMAVONXT: Stata module to compute Panel Data Autocorrelation Von Neumann Ratio Test***by*Emad Abd Elmessih Shehata & Sahra Khaleel A. Mickaiel**KATEGO: Stata module to split a continuous numerical variable in custom categories***by*Andres L Gonzalez Rangel**MMWS: Stata module to perform marginal mean weighting through stratification***by*Ariel Linden

### 2013

**MLT: Stata module to provide multilevel tools***by*Katja Moehring & Alexander Schmidt**BOXTID: Stata module to fit Box-Tidwell and exponential regression models***by*Patrick Royston**STGENREG: Stata module to fit general parametric survival models***by*Michael J. Crowther & Paul Lambert**CNTRADE: Stata module to retrieve Chinese stock market quotations from NetEase***by*Chuntao Li & Xuan Zhang**PARAMED: Stata module to perform causal mediation analysis using parametric regression models***by*Richard Emsley & Hanhua Liu**ROLLSTAT: Stata module to compute rolling-window statistics for time series or panel data***by*Maximo Sangiacomo & Demian Panigo**SPARKLINE: Stata module for sparkline-type plots***by*Nicholas J. Cox**DFTOL: Stata module to compute distribution-free tolerance intervals***by*Ignacio López de Ullibarri**PAYPER: Stata module to compute the periodic payment and the entire schedule of a loan or annuity***by*Maximo Sangiacomo**PVFIX: Stata module to compute the present value of a series of equal payments (cash flows)***by*Maximo Sangiacomo**TTABLE2: Stata module to produce Mean Comparison for many variables between two groups with formatted table output***by*Xuan Zhang & Chuntao Li**FVFIX: Stata module to compute the future value of a series of equal payments (cash flows)***by*Maximo Sangiacomo**BIRTHSIM: Stata module to simulate completed fertility and birth intervals***by*Stephen Cranney**GS3SLSAR: Stata module to estimate Generalized Spatial Autoregressive Three Stage Least Squares (3SLS) Cross Sections Regression***by*Emad Abd Elmessih Shehata**PWMC: Stata module to compute pairwise multiple comparisons (unequal variances)***by*Daniel Klein**R2C: Stata module to compute several fit statistics for count data models***by*Joseph N. Luchman**TRIMMEAN: Stata module for trimmed means as descriptive or inferential statistics***by*Nicholas J. Cox**TRIMPLOT: Stata module for plots of trimmed means***by*Nicholas J. Cox**CLSTOP_LBT: Stata module to add stopping rule in cluster analysis***by*Dirk Enzmann**PCIPLOT: Stata module to plot pointwise confidence intervals***by*Patrick Royston**IRR: Stata module to calculate the (periodic) internal rate of return for a series of periodic cash flows***by*Maximo Sangiacomo**REL_CLUST: Stata module to compute indices of relative clusterability of variables***by*Dirk Enzmann**QOGBOOK: Stata module to access Quality of Government codebooks***by*Richard Svensson**LANDEMETS: Stata module to compute boundaries for group sequential clinical trials using alpha spending functions***by*Ignacio López de Ullibarri**MUNDLAK: Stata module to estimate random-effects regressions adding group-means of independent variables to the model***by*Francisco (Paco) Perales**EMAIL: Stata module to send emails from Stata via Python***by*William Buchanan**CCMPRE: Stata module to compute PRE Measures for Cultural Consensus Models***by*Mike Lacy**ERATE: Stata module to import up-to-date exchange rates for any currency pairs***by*Damian Clarke & Pavel Luengas Sierra**CEQ: Stata module to carry out Commitment to Equity (CEQ) fiscal incidence analysis***by*Rodrigo Aranda & Sean Higgins**PSEMAIL: Stata module to send email from within Stata for Windows environment***by*Xuan Zhang & Dongliang Cui & Chuntao Li**STATICFC: Stata module to compute static forecasts for a recursive rolling regression***by*Christopher F Baum**PVVAR: Stata module to compute the present value of a series of payments (cash flows)***by*Maximo Sangiacomo**FVVAR: Stata module to compute the future value of a series of payments (cash flows)***by*Maximo Sangiacomo**XSMLE: Stata module for spatial panel data models estimation***by*Federico Belotti & Gordon Hughes & Andrea Piano Mortari**VALCUOFON: Stata module for downloading daily share values and assets balances of Chile's unemployment insurance funds and pension system***by*George Vega Yon**PBREG: Stata module to fit the Preece and Baines (1978) family of growth curves and age, height, and velocity at peak height velocity***by*Adrian Sayers**AMCMC: Stata module to provide Mata functions and structures for adaptive Markov chain Monte Carlo sampling***by*Matthew Baker**ELLIPTICITY: Stata module to compute optimal rank-based multivariate tests of elliptical symmetry and sphericity***by*Vincenzo Verardi & Catherine Vermandele**EVENTSTUDY: Stata module to perform event studies in finance***by*Xuan Zhang & Chuntao Li & Xin Xu**IPDFOREST: Stata module to produce forest plot for individual patient data IPD meta-analysis (one stage)***by*Evangelos Kontopantelis & David Reeves**SWAIN: Stata module to correct the SEM chi-square overidentification test in small sample sizes or complex models***by*John Antonakis & Nicolas Bastardoz**HOISHAPLEY: Stata module to perform Shapley Decomposition of the Human Opportunity Index***by*Alejandro Hoyos Suarez**NORMALIZEPATH: Stata module to parse (and normalize) files' paths***by*George Vega Yon**BAYESMIXEDLOGIT: Stata module to perform Bayesian estimation of mixed logit models***by*Matthew Baker**INSINGAP: Stata module to insert a single gap observation at the top of each by-group***by*Roger Newson**PISAREG: Stata module to perform linear regression with PISA data and plausible values***by*Maciej Jakubowski**SCHEME-BURD: Stata module to provide a ColorBrewer-inspired graphics scheme with qualitative and blue-to-red diverging colors***by*François Briatte**CRATER: Stata module to calculate computer scorer vs. human rater agreement statistics***by*Leah W. McGuire**SIMPUTE: Stata module to evaluate the effect of missing data on a published clinical trial***by*Adrian Mander**CRM: Stata module to implement the continual reassessment model***by*Adrian Mander**POPSIM: Stata module to simulate completed fertility and birth intervals for two generations***by*Stephen Cranney**RMFILES: Stata module to provide a convenient way to remove matched files within a specified directory and possibly, if applicable, corresponding empty directories (which will also, if wanted, be applied recursively to a matched subset of offspring-directories)***by*Lars Angquist**MVFILES: Stata module to provide a convenient way to move/copy matched files from a specified input directory (also including, if wanted, additionally recursively matched subsets of files within distinctly matched offspring-directories) to a specified output directory***by*Lars Angquist**EXCELSAVE: Stata module to provide a convenient way to export matched Stata datasets from a specified input directory (also including, if wanted, additionally recursively matched subsets of files within distinctly matched offspring-directories) to Excel-files***by*Lars Angquist**DOMIN: Stata module to conduct dominance analysis***by*Joseph N. Luchman**KSI: Stata module to compute Krugman specialization index***by*Muhammad Rashid Ansari**LMNADXT: Stata module to compute Panel Data Non Normality Anderson-Darling Test***by*Emad Abd Elmessih Shehata & Sahra Khaleel A. Mickaiel**LMHWALD: Stata module to compute OLS Heteroscedasticity Wald Test***by*Emad Abd Elmessih Shehata & Sahra Khaleel A. Mickaiel**LMAZ: Stata module to compute OLS Autocorrelation Z Test at Higher Order AR(p)***by*Emad Abd Elmessih Shehata & Sahra Khaleel A. Mickaiel**LMABXT: Stata module to compute Panel Autocorrelation Baltagi Test***by*Emad Abd Elmessih Shehata & Sahra Khaleel A. Mickaiel**SFCROSS: Stata module for cross-sectional stochastic frontier models estimation***by*Federico Belotti & Silvio Daidone & Vincenzo Atella & Giuseppe Ilardi**SFPANEL: Stata module for panel data stochastic frontier models estimation***by*Federico Belotti & Silvio Daidone & Vincenzo Atella & Giuseppe Ilardi**RIDGE2SLS: Stata module to compute Two-Stage Least Squares (2SLS) Ridge & Weighted Regression***by*Emad Abd Elmessih Shehata & Sahra Khaleel A. Mickaiel**QUANDL: Stata module to obtain data from Quandl using the Quandl API***by*Felix Leung**SCOREGRP: Stata module to perform a score test for equality of parameters across groups of observations***by*Paulo Guimaraes**GEOCHART: Stata module to create interactive map web pages from Stata data***by*Sergiy Radyakin**SPMSTARDH: Stata module to Estimate (m-STAR) Spatial Multiparametric Spatio Temporal AutoRegressive Regression: Spatial Durbin Multiplicative Heteroscedasticity Cross Sections Models***by*Emad Abd Elmessih Shehata & Sahra Khaleel A. Mickaiel**SPREGSAR: Stata module to estimate Maximum Likelihood Estimation Spatial Lag Cross Sections Regression***by*Emad Abd Elmessih Shehata & Sahra Khaleel A. Mickaiel**KITCHENSINK: Stata module to return the model with the highest number of statistically significant predictors***by*Francisco (Paco) Perales**RASCHFIT: Stata module to implement the Raschfit algorithm defined by Hardouin and Mesbah (2004)***by*Jean-Benoit Hardouin**SF36FR: Stata module to compute the scores of the French versions of the SF36 questionnaire***by*Jean-Benoit Hardouin**LCMC: Stata module to estimate latent class missing covariate model for continous main response, ordinal covariate with missing values, and informative selection***by*Alfonso Miranda & Sophia Rabe-Hesketh**CMAXUSE: Stata module to access Cmax instructional datasets***by*Christopher F Baum**ASL_NORM: Stata module computing bootstrap Gaussianity tests***by*Maarten L. Buis**GGTAX: Stata module to identify the most suitable GG family model***by*Andres L Gonzalez Rangel**MATAMATRIX: Stata module to enable using Mata functions on Stata matrices***by*Timothy Mak**RCENTILE: Stata module to compute robust confidence intervals for percentiles***by*Roger Newson**HILDASETUP: Stata module to create a longitudinal dataset for the Household, Income and Labour Dynamics in Australia (HILDA) Survey***by*Francisco (Paco) Perales**STLDA: Stata module for Limiting Dilution Analysis (LDA)***by*Ignacio López de Ullibarri**MCMCCQREG: Stata module to perform simulation assisted estimation of censored quantile regression using adaptive Markov chain Monte Carlo***by*Matthew Baker**REPSAMPLE: Stata module to perform representative sampling from a population or theoretical distributions***by*Evangelos Kontopantelis**MRPROBIT: Stata module to estimate probit with Misclassification of the Dependent Variable***by*Nikolas Mittag**CONDDENS: Stata module to estimate a conditional density to correct for measurement error and missing values***by*Nikolas Mittag**CDDENS: Stata module to estimate a Density under Measurement Error using Auxiliary Information***by*Nikolas Mittag**CDREG: Stata module to estimate Linear Regression under Measurement Error using Auxiliary Information***by*Nikolas Mittag**RSOORT: Stata module to perform Oort's Structural Equations Modeling (SEM) based procedure to detect Response Shift***by*Jean-Benoit Hardouin**LABELLACKING: Stata module to report numeric variables with values lacking value labels***by*Nicholas J. Cox & Robert Picard**TMPM: Stata module to implement Trauma Mortality Prediction Model using AIS, ICD-9 or ICD-10 codes***by*Alan Cook**DOSERESPONSE2: Stata module to estimate generalized propensity score***by*Marco Ventura & Barbara Guardabascio**GPSCORE2: Stata module to estimate the parameters of the conditional distribution of the treatment via GLM***by*Marco Ventura & Barbara Guardabascio**SURVEYBIAS: Stata module to compute the B and B_w multinomial accuracy measures for polling bias***by*Kai Arzheimer**USE13: Stata module to import Stata 13 (*.dta) data into older versions of Stata***by*Sergiy Radyakin**ACTEST: Stata module to perform Cumby-Huizinga general test for autocorrelation in time series***by*Christopher F Baum & Mark E Schaffer**BOXPANEL: Stata module to produce box plots for panel data***by*Brent McSharry**POVTIME: Stata module to compute aggregate intertemporal poverty measures (poverty in a panel accounting for time)***by*Carlos Gradin**CLRBOUND: Stata module to perform estimation and inference on intersection bounds***by*Victor Chernozhukov & Wooyoung Kim & Sokbae Lee & Adam M. Rosen**TTAB: Stata module to produce formatted tables with t-test for two-groups mean-comparison***by*Federico Belotti**TIHTEST: Stata module to test for time invariant unobserved heterogeneity in GLMs for panel data***by*Federico Belotti**PSACALC: Stata module to calculate treatment effects or bounds under proportional selection of observables and unobservables***by*Emily Oster**VALIDLY: Stata module to correct Stata’s handling of missing values in logical and relational expressions***by*Kenneth Macdonald**LMADURMXT: Stata module to compute Panel Data Autocorrelation Dynamic Durbin m Test***by*Emad Abd Elmessih Shehata & Sahra Khaleel A. Mickaiel**LMNWHITEXT: Stata module to compute Panel Data Non Normality White Test***by*Emad Abd Elmessih Shehata & Sahra Khaleel A. Mickaiel**SPREGSAC: Stata module to estimate Maximum Likelihood Estimation AutoCorrelation (SAC) Cross Section Regression***by*Emad Abd Elmessih Shehata & Sahra Khaleel A. Mickaiel**SPMSTARDHXT: Stata module to estimate (m-STAR) Spatial Multiparametric Spatio Temporal AutoRegressive Regression: Spatial Durbin Multiplicative Heteroscedasticity Panel Models***by*Emad Abd Elmessih Shehata & Sahra Khaleel A. Mickaiel**SPTOBITMSTARDXT: Stata module to estimate Tobit (m-STAR) Spatial Multiparametric Spatio Temporal AutoRegressive Regression: Spatial Durbin Panel Models***by*Emad Abd Elmessih Shehata & Sahra Khaleel A. Mickaiel**WEAKIV: Stata module to perform weak-instrument-robust tests and confidence intervals for instrumental-variable (IV) estimation of linear, probit and tobit models***by*Keith Finlay & Leandro Magnusson & Mark E Schaffer**PROJECT: Stata module providing a set of tools to build and manage a Stata project***by*Robert Picard**COEFPLOT: Stata module to plot regression coefficients and other results***by*Ben Jann**DFSUMMARY: Stata module to compute the (Augmented) Dickey-Fuller unit-root test and reports a summary table for different lags***by*Maximo Sangiacomo**PYTHON: Stata module for using the Python language within Stata***by*James Fiedler**AVAR: Stata module to perform asymptotic covariance estimation for iid and non-iid data robust to heteroskedasticity, autocorrelation, 1- and 2-way clustering, and common cross-panel autocorrelated disturbances***by*Christopher F Baum & Mark E Schaffer**TWOFOLD: Stata module to perform multiple imputation using the two-fold fully conditional specification algorithm to impute missing values in longitudinal data***by*Cathy Welch**POWERSIM: Stata module for simulation-based power analysis for linear and generalized linear models***by*Joerg Luedicke**LMHHPXT: Stata module to compute Panel Data Heteroscedasticity Hall-Pagan Test***by*Emad Abd Elmessih Shehata & Sahra Khaleel A. Mickaiel