it's a good question, I would like an answer too, but I don't know if anyone can provide any. There are lot's of good statistical packages like Stata, JMP, Minitab, Systat, Statistica, XLSTAT,....but I noticed too, that the biggest majority of companies work with SAS and SPSS. Don't know why, I mean SPSS is very easy to use and easy to get addicted to, SAS is VERY powerful, but there must be another reason.





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