Independent European Group of SPSS Users
Can I find out how SPSS does its statistical calculations?
Details of the statistical algorithms used by SPSS are available on the Web at http://www.spss.com/tech/stat/Algorithms.htm as a series of Adobe PDF files (for the individual commands).
Anyone insisting on a printed manual will have to make do with a little piece of ancient history, SPSS 7.5 Statistical Algorithms - still on sale. Note that despite the title the contents were last updated for SPSS 7.0.
Last amended 16 January 2002