Letters

Power is indeed irrelevant in interpreting completed studies

BMJ 2002; 325 doi: https://doi.org/10.1136/bmj.325.7375.1304 (Published 30 November 2002) Cite this as: BMJ 2002;325:1304
  1. Stephen J Senn, professor of pharmaceutical and health statistics (stephen@senns.demon.co.uk)
  1. University College London, London WC1E 6BT

    EDITOR—I agree with Bacchetti (and most correspondents).1 Power is of no relevance in interpreting a completed study. In his classic, Planning of Experiments, Sir David Cox says that power is important in choosing between alternative methods of analysing data and in deciding on an appropriate size of experiment and that it is quite …

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