SAS code for describing and plotting withdrawal rates

These SAS macros provide basic information to characterize withdrawal/dropout information in the data set which can be the preliminary step of the missing data analyses. The descriptive summary statistics outputs provide visitwise percentages of patients with at least one post-baseline observation that have data at subsequent visits as well as visitwise response means by treatment for patients that dropout versus those that continue. The plot outputs include Kaplan-Meier plot of time to dropout by treatment and plot of visitwise response mean changes from baseline by treatment and dropout status (dropout or continue).

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