This book contains the content of the ActivEpi CD-ROM pages plus additional exercises and an appendix on computer packages.

Introduction * Epidemiologic Research: An Overview * Epidemiologic Study Designs * Measures of Disease Frequency * Measure of Effect * Measures of Potential Impact * Validity and General Considerations * Selection Bias * Information Bias * Confounding * Confounding Involving Several Risk Factors * Statistical Inferences about Effect Measures * Control of Extraneous Factors * Stratified Analysis