SUDAAN is a single program consisting of a family of procedures used to analyze data from complex surveys and other observational and experimental studies involving cluster-correlated data. A complex sample may be multistage, stratified, or clustered. Many samples also have unequal probabilities of selection, or are drawn from finite populations.
SUDAAN enables you to use survey data to obtain consistent estimates of population parameters and their standard errors in accordance with the sample design. SUDAAN also produces consistent estimates of regression coefficients, descriptive statistics, and their associated standard errors for cluster-correlated and repeated measures data applications in clinical, epidemiological, toxicological, and behavioral research.