Two excellent open source programs with a lot of mathematical and statistical power are R ( www.r-project.org) and MacAnova ( www.stat.umn.edu/macanova). Both are used in college level teaching of elementary and advanced statistical topics. R is almost a clone of S-Plus and MacAnova is in the same family but is not closely related. Both are extendable by writing functions or macros.
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Two excellent open source programs with a lot of mathematical and statistical power are R ( www.r-project.org) and MacAnova ( www.stat.umn.edu/macanova). Both are used in college level teaching of elementary and advanced statistical topics. R is almost a clone of S-Plus and MacAnova is in the same family but is not closely related. Both are extendable by writing functions or macros.