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(py)Lucene based software for text management. Available at www.txtorg.org.

R package containing variational EM algorithms for estimating topic models with covariates. Available at www.structuraltopicmodel.com

R package for browser based visualization of topic models, with Michael Freeman, Margaret Roberts and Brandon Stewart. Available at www.structuraltopicmodel.com

R package for sparse and consistent Bayesian Lasso estimation, with Marc Ratkovic. Available at http://cran.r-project.org/web/packages/sparsereg

R package for automated access to Google and Microsoft Bing APIs for machine translation, with Christopher Lucas. Available at http://cran.r-project.org/web/packages/translateR

R package for hierarchial visualization of topic correlations, with Antonio Coppola, Margaret Roberts and Brandon Stewart. Available at http://cran.r-project.org/web/packages/stmCorrViz

R package for automated access to HP API for machine transcription, with Christopher Lucas, Dean Knox, Thomas Scanlan, Shiv Sunil, Michael May, Angela Su. Available at http://cran.r-project.org/web/packages/transcribeR

Stata program for calculating mediation effects. Written with Raymond Hicks, Princeton. To install type "ssc install mediation" into command window. Requires version 10 or higher.

mediation is a publicly available R package that allows both parametric and nonparametric causal mediation analysis. It implements the methods and suggestions in Imai, Keele, and Yamamoto (2010) and Imai, Keele, and Tingley (2010). The package won the...