67A Designed extension of studies based on conditional power
Citations
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Cites background or methods from "67A Designed extension of studies b..."
...Conditional power calculations may be performed (Proschan and Hunsberger, 1995) that are based on the observed effect size at some stage k of the procedure....
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...The first (Bauer and K6hne, 1994) is based on Fisher's combination test and the second (Proschan and Hunsberger, 1995) is based on the specification of a conditional error function....
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497 citations
Cites background from "67A Designed extension of studies b..."
...Recently, Proschan and Hunsberger (1995) proposed a method of extending a nonsequential study based on the observed treatment difference....
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370 citations
368 citations
Cites methods from "67A Designed extension of studies b..."
...As an example, if unblinded data (with knowledge or use of treatment allocation such that the interim treatment effect can be inferred) are used to adjust the sample size at the interim, then the inflation to the planned type I error can be substantial and needs to be accounted for [16, 34, 35, 88]....
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331 citations
References
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