Comparing Groups

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 estimate relative risk using odds ratios, cumulative incidence ratios, and other useful measures of association.
• Compare event rates, also known as person-time data, and estimate prevalence and incidence rates.
• Infer causal relationships between the predictors and the outcome from the results of your regression model.