Part III

Comparing Groups

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Illustration by Wiley, Composition Services Graphics

pt_webextra_bw.TIF Discover the uses and steps of the simulation approach in a free article at www.dummies.com/extras/biostatistics.

In this part . . .

check  Compare averages between two or more groups, using t tests, ANOVAs, and nonparametric tests.

check  Compare proportions between two or more groups, using the chi-square and Fisher Exact tests.

check  Analyze fourfold tables (also known as 2x2 cross-tabs) to get relative risks, odds ratios, and loads of other useful measures of association.

check  Compare event rates, also known as person-time data.

check  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).

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