Software Packages Manuals and Books

Vijay Gupta has authored a number of excellent books, including SPSS for Beginners, Interpreting Regression Output, Comprehensive Excel, Excel for Beginners, Charting in Excel, Excel - Beyond the Basics, Managing & Tabulating Data in Excel, Statistical Analysis with Excel, and Financial Analysis Using Excel. You can purchase and download these books from his web site, and you can download many sections of  the individual books for free.

A textbook on evaluation, statistics, and measurement, developed by Bill Miller of Iowa State U, in conjunction with his free OpenStat statistical package. The software and textbook are both available for free download from his web site.

Data Analysis with Epi Info -- an online textbook by Bud Gerstman. Describes analyses for continuous or binary outcomes; single group, paired samples, or two or more independent groups; one or more continuous predictors; stratified tables (with confounding and interaction); and much more.

Curvefit.com -- a complete guide to nonlinear regression. Most of the information here is excerpted from Analyzing Data with GraphPad Prism, a book that accompanies the program GraphPad Prism. You can download this book as a pdf file.

Graphpad web site of statistical resources -- short articles, book chapters, bibliographies, and (commercial) software. Well-written, down-to-earth, and helpful.

The Instat Guide to Choosing and Interpreting Statistical Tests, from Graphpad.

Electronic Statistics Textbook (by StatSoft) -- very extensive and well-organized (can also be downloaded for quicker access from your hard drive)