StatXact – NonParametric Inference

StatXact software is a suite of statistical tools that provide exact inference in the nonparametric statistical inference setting. StatXact has a large number of statistical procedures addressing one, two or K-sample problems, problems involving contingency tables, measures of association and StatXact addresses stratified settings as well. These tools provide assurance of p-values in small sample, unbalanced or missing sampled data settings. A related product, LogXact is their exact logistic regression tool for similar situations. Added recently are options for Penalized Maximum Likelihood Estimation and methods for dealing with missing categorical covariates in GLM settings using Logit, Probit, CLogLog, Poisson, and Normal links.
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http://www.cytel.com