Power TOST question [Power / Sample Size]

posted by d_labes  – Berlin, Germany, 2024-02-22 10:54 (57 d 23:58 ago) – Posting: # 23871
Views: 657

Dear Achievwin,

❝ When we use pa.ABE for parallel study N determination output gives N for certain power (e.g. if N=424 for 85% power) is this N is for total (N=424) or per arm (212+212)?


Call the man page of the function sampleN.TOST() and read under Details

The estimated sample size gives always the total number of subjects (not subject/sequence in crossovers or subjects/group in parallel designs – like in some other software packages)."


That is valid for all the other sample size estimating functions.

The power calculating functions accept a single number as sample size, here also the total.
Also accepted a vector of sample sizes, here meaning the sample sizes of groups.

Regards,

Detlew

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