Computing effect sizes

• Cohen's d which is used for t-tests may be computed using free [http://www.swin.edu.au/victims/resources/software/effectsize/effect_size_generator.html PC downloadable software.]

• SPSS computes partial eta-squared, $$\mbox{Partial } \eta^text{2}$$, on request using ANOVAs. If using General Linear Model>univariate or General Linear Model>Repeated Measures click options and select Estimates of Effect Size. An extra column in the outputted anova tables is produced showing partial eta-squareds of terms in the anova table.

• An EXCEL spreadsheet calculator is to appear here for computing the odds ratio effect size w.

• [:FAQ/effectSize:A guide to magnitudes of effect sizes.]