Statistical Software Components
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- SMWOODBURY: Stata module to compute Sherman-Morrison-Woodbury rank-k update to matrix inverse

- Sam Schulhofer-Wohl
- SOEPDO: Stata module to handle SOEP drop-outs

- Tim Stegmann
- SOEPREN: Stata module providing easy SOEP renames

- Ulrich Kohler
- SOEPUSE: Stata module providing easy SOEP access

- Ulrich Kohler
- SOMERSD: Stata module to calculate Kendall's tau-a, Somers' D and median differences

- Roger Newson
- SOREG: Stata module to implement the stereotype ordinal regression model

- Mark Lunt
- SORTL: Stata module to sort factor loadings or rotated matrix from PCA or factor

- Dirk Enzmann
- SORTLISTBY: Stata module to sort by random or by ancillary numlist

- Ben Jann
- SORTOBS: Stata module to sort observations according to a specified order

- Julian Reif
- SORTROWS: Stata program to perform sort within observation

- Jeffrey Arnold
- SPACES: Stata module to parse a file for delimiters

- Jan Brogger
- SPAGG: Stata module to create aggregate source or target contagion spatial effect variable for directed dyadic data

- Eric Neumayer and Thomas Plümper
- SPARKLINE: Stata module for sparkline-type plots

- Nicholas Cox
- SPARL: Stata module to produce scatter plot and y-x regression line

- Nicholas Cox
- SPATDWM: Stata modules for US State and County spatial distance matrices

- Yihua Yu
- SPATIALRATS_1: RATS module to estimate a spatial linear regression

- Eric Blankmeyer
- SPATIALSTATS: Excel module to compute spatial statistics

- Roger Goodwin, PMP
- SPAUTOC: Stata modules to calculate spatial autocorrelation (Moran and Geary measures)

- Nicholas Cox
- SPAUTOREG: Stata module to estimate Spatial (Lag-Error-Durbin-SAC-SPGKS-SPGSAR-GS2SLS-GS3SLS-SPML-SPGS-SPIVREG-IVTobit)

- Emad Shehata
- SPCS2XT: Stata module to Convert Cross Section to Panel Spatial Weight Matrix

- Emad Shehata
- SPDIR: Stata module to create directed dyad contagion spatial effect variable

- Eric Neumayer and Thomas Plümper
- SPEARMAN2: Stata module to calculate Spearman rank correlations, extended

- Christopher Baum
- SPEC_STAND: Stata module to create dataset of stratum-specific, unadjusted and standardized rates

- Rosa Gini
- SPECFORE: RATS procedure to compute forecasts using spectral techniques

- Tom Doan
- SPECHIST: Stata module to produce specific histograms for continuous variables

- Alfonso Sánchez-Peñalver
- SPECIALEXP: Stata module to obtain expression that evaluates to specified string

- Matthew White
- SPECTDENS: Stata module to compute sample spectral density

- Huseyin Tastan
- SPECTRUM: RATS procedure to compute/graph spectral density

- Tom Doan
- SPEEDERGLES: Stata module to compute the GLES response speed index

- Joss Roßmann
- SPELL: Stata module for identification of spells or runs of similar values

- Nicholas Cox and Richard Goldstein
- SPELLUTIL: Stata module of utilities for the manipulation of timespan data

- Edwin Leuven
- SPGEN: Stata module to generate spatially lagged variables

- Keisuke Kondo
- SPGLSXT: Stata module to estimate Spatial Panel Autoregressive Generalized Least Squares Regression

- Emad Shehata
- SPGMM: Stata module to estimate Spatial Autoregressive Generalized Method of Moments Cross Sections Regression

- Emad Shehata
- SPGMMXT: Stata module to estimate Spatial Panel Autoregressive Generalized Method of Moments Regression

- Emad Shehata
- SPGRID: Stata module to generate two-dimensional grids for spatial data analysis

- Maurizio Pisati
- SPHDIST: Stata module to compute spherical distances

- Bill Rising
- SPIKE: Stata module to allow for a zero willingness to pay

- João Pedro Azevedo
- SPIKEPLT: Stata module to generate spike plot showing fine structure of the data

- Nicholas Cox and Tony Brady
- SPINEPLOT: Stata module for spine plots for two-way categorical data

- Nicholas Cox
- SPKDE: Stata module to perform kernel estimation of density and intensity functions for two-dimensional spatial point patterns

- Maurizio Pisati
- SPLAGVAR: Stata module to generate spatially lagged variables, construct the Moran Scatter plot, and calculate Moran's I statistics

- P. Wilner Jeanty
- SPLIT: Stata modules for splitting string variables into parts

- Nicholas Cox
- SPLITIT: Stata module to split chronological overlapping spells in spell data

- Klaudia Erhardt and Ralf Kuenster
- SPLITVALLABELS: Stata module to split up value labels for multi-line graph labelling

- Nicholas Winter and Ben Jann
- SPMAP: Stata module to visualize spatial data

- Maurizio Pisati
- SPMLREG: Stata module to estimate the spatial lag, the spatial error, the spatial durbin, and the general spatial models by maximum likelihood

- P. Wilner Jeanty
- SPMON: Stata module to create spatial effect variable for monadic data

- Eric Neumayer and Thomas Plümper
- SPMSTAR: Stata module to Estimate (m-STAR) Spatial Multiparametric Spatio Temporal AutoRegressive Regression Models

- Emad Shehata
- SPMSTARD: Stata module to estimate Multiparametric Spatio Temporal AutoRegressive Regression Spatial Durbin Cross Sections Models

- Emad Shehata and Sahra Mickaiel