This page gives a description of correlation, Pearson's r, Spearman's rho. There are some scatterplots illustrating the different values of r.
Describes dummy coding for categorical variables. Addresses types of coding schemes and ANOVA.
A paper discussing the development of construct validity as applied to psychological studies.
DataCounts! is an interactive website designed to help integrate social statistics into the classroom setting. Each collection contains a wide variety of datasets that can be viewed online with...
Research Randomizer is a free service offered to "assist researchers and students who want an easy way to perform random sampling or assign participants to experimental conditions."
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