• Mediator versus Moderator variables
• Factor analysis versus Principal Components Analysis (PCA)
• Computing power for a Mann-Whitney test (a .pdf file from Roger Brown)
• A brief introduction to using SPSS for Windows
• Power Analysis
• Choosing the proper statistical test

• ERIC/AE.net - on-line, full-text books and booklets addressing practical evaluation, research, measurement, and statistical issues. The series started as a joint project of ERIC/AE and Bruce Thompson, Texas A&M University.
• PSPP - open source version of SPSS that is being developed as a free alternative to the popular software package. Currently the software computes descriptive statistics, t-tests, one way anova's, linear regression, reliabilities and principal components. It is limited but might meet the needs of an introductory stats class.
• SPSS - company home page for the popular statistics package with links to white papers, newsletters, demos, and tutorials.
• SPSS Techniques - A collection of tutorials from UCLA. These links provide an overview of the basics as well as some specific statistical procedures.
• SPSS Tutorials from University of Texas
• SPSS Online Documentation - from the University of Washington
• If you have a particular question about an SPSS statistical procedure, you might find the answer at the SPSS AnswerNet
• SAS - I personally feel that SAS is a better statistical package than SPSS. This link is to their support site. You can also access the SAS/STAT or SAS home pages.
• Interactive Statistical Calculations Page - This site has links to over 300 sites that perform interactive statistical calculations, everything from random number generators to analysis of survival data.
• QualPage - useful links for qualitative researchers (as opposed to quantitative researchers) including publications, conferences, methods, articles and organizations.
• Prove it with Data - Hossein Arsham has a large statistics page that includes syntax for SPSS runs and provides lots of statistical definitions.
• Hyperstat Online - An online statistics textbook by David Lane.

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