Letters

“Evidence of absence” can be important

BMJ 2003; 326 doi: https://doi.org/10.1136/bmj.326.7401.1267 (Published 05 June 2003) Cite this as: BMJ 2003;326:1267
  1. Michael Joffe, reader in epidemiology (m.joffe@imperial.ac.uk)
  1. Imperial College London, St Mary's Campus, London W2 1PG

    EDITOR—Alderson and Chalmers are rightly critical of those who make inappropriate claims, but they are themselves guilty of this.1 Compare these statements: “It is never correct to claim that treatments have no effect or that there is no difference in the effects of treatments”, and “Absence of evidence is not evidence of …

    View Full Text

    Sign in

    Log in through your institution

    Free trial

    Register for a free trial to thebmj.com to receive unlimited access to all content on thebmj.com for 14 days.
    Sign up for a free trial

    Subscribe