Grayling MJ, Wason JMS, Mander AP. Group sequential clinical trial designs for normally distributed outcome variables.
Stata J 2018;
18:416-431. [PMID:
35125974 PMCID:
PMC7612318 DOI:
10.1177/1536867x1801800208]
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Abstract
In a group sequential clinical trial, accumulated data are analyzed at numerous time points to allow early decisions about a hypothesis of interest. These designs have historically been recommended for their ethical, administrative, and economic benefits. In this article, we first discuss a collection of new commands for computing the stopping boundaries and required group size of various classical group sequential designs, assuming a normally distributed outcome variable. Then, we demonstrate how the performance of several designs can be compared graphically.
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