p waffle module to produce waffle charts using percent or proportion variables p waffle_plot module to produce waffle plots p wald_mse module to calculate the maximum mean square error (MSE) of a point estimator of the mean p wbdata module to access World Bank databases p wbopendata module to access World Bank databases p wbull module to fit Weibull distribution by maximum likelihood p wcbregress module to estimate a Linear Regression Model with Clustered Errors Using the Wild Cluster Bootstrap Standard Errors p wclogit module to perform conditional logistic regression with within-group varying weights p wdireshape module to reshape World Development Indicators database p wdiscrim module to compute earnings discrimination statistics p weai module to compute different versions of the Women's Empowerment in Agricultural Index (WEAI) p weakiv module to perform weak-instrument-robust tests and confidence intervals for instrumental-variable (IV) estimation of linear, probit and tobit models p weakiv10 module to perform weak-instrument-robust tests and confidence intervals for instrumental-variable (IV) estimation of linear, probit and tobit models p weakivtest module to perform weak instrument test for a single endogenous regressor in TSLS and LIML p weakivtest2 module to compute Robust Test for Weak Instruments with Multiple Endogenous Regressors p weathr module to display US weather conditions p weaver module to produce dynamic reports in HTML, LaTeX and PDF p webdoc module to create a HTML or Markdown document including Stata output p webimage module to print images from web files in pdf, png, jpeg, gif, and bmp format p weeklyclaims module to Get Weekly Initial Jobless Claims from the US Dept. of Labor p weibullfit module to fit a two-parameter Weibull distribution p welcom module for simulating distributional impacts of changes in competition (WELCOM) p welflossas module to compute well-being (monetary) gain/loss measures and social welfare loss indices and curves associated with segregation using either disaggregated or aggregated data for the quantitative variable p wgtdistrim module for trimming extreme sampling weights p wgttest module to test the impact of sampling weights in regression analysis p whereis module to keep track of ancillary programs and files p which_version module to return location and programmer's version of ado-files p whichlist module to input list of package file items and output lists of present and absent items p whichpkg module to display information on components of a Stata package p white module to perform White's test for heteroscedasticity p whitetst module to perform White's test for heteroskedasticity p whittle module to compute long-memory parameter via Whittle method p whotdeck module to perform multiple imputation using the Approximate Bayesian Bootstrap with weights p wid module to download data from the World Inequality Database (WID.world) p williams module to estimate logistic regression via Williams procedure p windowsmonitor module to send a winexec command to a Windows operating system and display the output in the Stata results window in (almost) real time p winprob module to compute the win probability for a single outcome p winratio module to calculate the unmatched Win Ratio for prioritised outcomes p winratiotest module to calculate the unmatched Win Ratio for prioritised outcomes p winsor module to Winsorize a variable p winsor2 module to winsorize data p winsor4 module to winsorize a variable based on outliers defined by either percentiles or interquartile range p witch module to mystically manage files on adopath p wntstmvq module to compute multivariate Ljung-Box Q test p wooldid module to estimate Difference-in-Differences Treatment Effects with Staggered Treatment Onset Using Heterogeneity-Robust Two-Way Fixed Effects Regressions p wordcb module to create a codebook in MS Word format p wordcloud module for drawing word cloud figure based on echarts developed by Baidu p wordconvert module to transfer files among several types in Windows p wordy module to play a silly word game and show your guesses on a Stata graph p workdays module to compute elapsed workdays p worldstat module to produce a visualisation of the state of world development p wosaddress module to convert datasets from Web of Science data from wide to long p wosload module to load datasets from Web of Science data p wridit module to generate weighted ridits p writeinput module to write dataset in memory to new do-file as an input command p writekml module to write Keyhole Markup Language file p writepsfrag module to translate Stata text to EPS p wscv module to compute the within-subject coefficient of variation p wtd module to produce analysis of waiting time distribution p wtd_perc module to calculate percentile of inter-arrival density based on the parametric Waiting Time Distribution (WTD) p wtdttt module to estimate parameters of the ordinary and reverse Waiting Time Distribution (WTD) by maximum likelihood p wtp module to estimate confidence intervals for willingness to pay measures p wtpcikr module to estimate Krinsky and Robb Confidence Intervals for Mean and Median Willingness to Pay p wwwhelp module to display the help document in PDF format of the specified command via browsers p wyoung module to perform multiple testing corrections