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Prespecified Stopping Plans
Prior to first analysis
of data, specify
•Rule for determining
maximal statistical information
•E.g., fix power,
maximal sample size, or calendar time
•Rule for determining
schedule of analyses
•E.g., according to
sample size, statistical information, or calendar time
•Rule for determining
conditions for early stopping
•E.g., boundary shape
function for stopping boundaries on the scale of some test
statistic