SAS

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This book is intended to be a guide to SAS programming. SAS is a commercial statistical software. SAS help is known to be messy and it is often difficult to find relevant documentation on a specific issue in SAS programming. There are lots of alternative to SAS. R is an open source and powerful statistical package. SPSS is easy to use. Stata is widely used in economics. SAS is especially adapted if you deal with very large datasets such as census data because it works directly on the data files without loading them in memory. Your contributions to this wikibook are welcome.