Statistical Software Components
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- PWMC: Stata module to compute pairwise multiple comparisons (unequal variances)

- Daniel Klein
- PWPLOTI: Stata module to plot power curve for sample size and power calculation

- Zhiqiang Wang
- PYRAMID: Stata tutorial for population pyramids

- Jens Lauritsen
- PYTHON: Stata module for using the Python language within Stata

- James Fiedler
- QAP: Stata module to perform quadratic assignment procedure

- William Simpson
- QBETA: Stata module to generate quantile-quantile plot for data vs fitted beta distribution

- Nicholas Cox
- QCONVERT: Stata module to convert a raw Q-sort file into a new Q-sort file which is ready for analysis by QFACTOR program

- Noori Akhtar-Danesh
- QCOUNT: Stata program to fit quantile regression models for count data

- Alfonso Miranda
- QENV: Stata module to generate quantile envelopes for quantile-quantile plots

- Maarten Buis and Nicholas Cox
- QEXP: Stata module to produce quantile-quantile plot for data vs fitted exponential distribution

- Nicholas Cox
- QFACTOR: Stata module to perform Q-analysis on Q-sorts using different factor extraction and factor rotation technique

- Noori Akhtar-Danesh
- QGAMMA: Stata module to generate quantile-quantile plot for data vs fitted gamma distribution

- Nicholas Cox
- QHAPIPF: Stata module to perform analysis of quantitative traits using regression and log-linear modelling when PHASE is unknown

- Adrian Mander
- QIC: Stata module to compute model selection criterion in GEE analyses

- James Cui
- QLL: Stata module to implement Elliott-Müller efficient test for general persistent time variation in regression coefficients

- Christopher Baum
- QLOGNORM: Stata module for diagnostic plots for lognormal distribution

- Nicholas Cox
- QLQC15: Stata module for scoring of the EORTC QLQ-C15-PAL

- Niels Henrik Bruun
- QOG: Stata module to access the most recent release of the "Quality of Government" data

- Christoph Thewes
- QOGBOOK: Stata module to access Quality of Government codebooks

- Richard Svensson
- QPFIT: Stata module containing various quantile and probability plots for assessing distribution fit

- Nicholas Cox
- QQCOMPARE: Stata module to evaluate balance after matching using quantile-quantile plots

- Sunil Mitra Kumar
- QQPLOT2: Stata module to produce quantile-quantile plot

- Nicholas Cox
- QQPLOT3: Stata module to plot the unweighted and weighted quantiles of one variable against the corresponding quantiles of another

- Ariel Linden
- QQVALUE: Stata module to generate quasi-q-values by inverting multiple-test procedures

- Roger Newson
- QREG2: Stata module to perform quantile regression with robust and clustered standard errors

- José António Machado, Paulo Parente and João Santos Silva
- QREGPD: Stata module to perform Quantile Regression for Panel Data

- Matthew Baker
- QRISK2CMD: Stata module to run QRISK2 from within Stata

- Roger Newson
- QROWNAME: Stata module to extract lists of quoted row and column names from a matrix

- Roger Newson
- QSIM: Stata module to produce variables for clarify routines

- Fred Wolfe
- QSTAT2: MATLAB function to compute Ljung-Box Q statistic

- Christopher Baum
- QSTAT: MATLAB module to calculate Ljung-Box q statistic

- Ludwig Kanzler
- QSUB: Stata module to emulate a cluster environment using your desktop PC

- Adrian Sayers
- QUADAS: Stata module to provide graphical depiction of quality assessment in diagnostic accuracy reviews

- Ben Dwamena
- QUANDL: Stata module to obtain data from Quandl using the Quandl API

- Felix Leung
- QUANTIL2: Stata module to generate multivariate quantile plot

- Nicholas Cox
- QUANTILEREG: MATLAB function to estimate quantile regression

- Shapour Mohammadi
- QUANTILES: Stata module to categorize by quantiles

- Rafael Osorio
- QUARTIMAX: RATS procedure to perform factor rotation using quartimax criterion

- Tom Doan
- QUICKICC: Stata module to compute intraclass correlation and standard error calculation after xtmixed

- Eric Hedberg
- QUINE: Stata module providing a self-producing program

- Matthew Baker
- QV: Stata module to compute quasi-variances

- Aspen Chen
- QWEIBULL: Stata module to generate quantile-quantile plot for data vs fitted Weibull distribution

- Nicholas Cox
- R2_MZ: Stata module to compute McKelvey & Zavoina's R2

- Dirk Enzmann
- R2C: Stata module to compute several fit statistics for count data models

- Joseph Luchman
- R2NLSUR: Stata module to perform Overall System (NL-SUR) System R2, Adj. R2, F-Test, and Chi2-Test

- Emad Shehata
- R2O: Stata module to calculate an ordinal explained variation statistic

- Mike Lacy
- R2REG3: Stata module to compute System R2, Adj. R2, F-Test, and Chi2-Test after reg3 or sureg

- Emad Shehata
- R2SEM: Stata module to perform Overall System Structural Equation Modeling (SEM) R2, Adj. R2, F-Test, and Chi2-Test

- Emad Shehata
- R2VAR: Stata Module to Compute (VAR) Overall System R2, F-Test, and Chi2-Test

- Emad Shehata and Sahra Mickaiel
- RADAR: Stata module to draw radar (spider) plots

- Adrian Mander