Part III
Comparing Groups
Illustration by Wiley, Composition Services Graphics
Discover the uses and steps of the simulation approach in a free article at www.dummies.com/extras/biostatistics.
In this part . . .
Compare averages between two or more groups, using t tests, ANOVAs, and nonparametric tests.
Compare proportions between two or more groups, using the chi-square and Fisher Exact tests.
Analyze fourfold tables (also known as 2x2 cross-tabs) to get relative risks, odds ratios, and loads of other useful measures of association.
Compare event rates, also known as person-time data.
Test for equivalence between two products (like generic and brand-name drugs) and for noninferiority with respect to an established treatment (when you can’t compare to a placebo).
