BOL has some good links to get you started:
http://msdn.microsoft.com/en-us/library/ms345131(SQL.90).aspx for 2005, http://msdn.microsoft.com/en-us/library/bb510516(v=SQL.100).aspx for 2008 and
http://msdn.microsoft.com/en-us/library/bb510516.aspx for 2008 R2.
Other alternative to consider is the R Project[/url], free, open-source, widely used in the statistical community. Not sure if there's any direct comparison to SQL Server out there, probably something comparing to SAS
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How best to post your question[/url]
How to post performance problems[/url]
Tally Table:What it is and how it replaces a loop[/url]
"stewsterl 80804 (10/16/2009)I guess when you stop and try to understand the solution provided you not only learn, but save yourself some headaches when you need to make any slight changes."