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http://ww2.coastal.edu/kingw/statistics/R-tutorials/formulae.html

R Tutorials--Model Formulae

This is a short tutorial on writing model formulae for ANOVA and regression analyses. It will be linked to from those tutorials, but you are welcome to read it just for kicks if you'd like. R functions such as aov( ), lm( ), and glm( ) use a formula interface to specify the variables to be included in the analysis.
We can test the overall interaction with the test command.

Regression with SPSS: Lesson 3 - Regression with Categorical Predictors

http://www.ats.ucla.edu/stat/spss/webbooks/reg/chapter3/spssreg3.htm

Regression: Statnotes, from North Carolina State University

http://faculty.chass.ncsu.edu/garson/PA765/regress.htm#stepwise1 This content is now available from Statistical Associates Publishers. Click here .
Home Online Help Analysis http://dss.princeton.edu/online_help/analysis/interpreting_regression.htm

DSS - Interpreting Regression Output

http://www.statsoft.com/textbook/basic-statistics/#Correlationsk

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