Stata

Data Analysis and Statistical Software for Professionals.

Stata is a complete, integrated statistical package that provides everything you need for data analysis, data management, and graphics. Stata is not sold in pieces, which means you get everything you need in one package without annual license fees.

Stata 11 adds many new features such as multiple imputation, factor variables, generalized method of moments (GMM), competing-risks regression, state-space modeling, predictive margins, a Variables Manager, and more.