• 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

• SIAM - Statistics Information & Advisory Mailing-list is Manchester Computing's electronic mailing list for information and advice on using statistical packages and methods. This site has links to information about statistical packages (new ones and updates to existing ones); tips on using statistical packages; useful statistical books, journals, articles, and Web sites; and courses, workshops, seminars and conferences on statistical packages and methods.
• ERIC/AE How To Series - 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.
• 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 the University of Washington. These links provide an overview of the basics as well as some specific statistical procedures.
• 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 FAQ's to all SAS/STAT procedures. You can also access the SAS/STAT or SAS home pages.
• S-PLUS - Home page for this high level statistics and graphing package.
• 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.
• Roger Brown is head of the Research Design and Statistics Unit (RDSU) at the University of Wisconsin - Madison. He has posted a number of methodological and statistical papers on the web. You will need the Adobe Acrobat Reader to view these documents.
• 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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