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Limitations of the Wilcoxon matched pairs signed ranks test for comparison studies
  1. P J Twomey1,
  2. A Viljoen2
  1. 1Department of Clinical Biochemistry, The Ipswich Hospital, Heath Road, Ipswich IP4 5PD, UK;
  2. 2Department of Clinical Biochemistry, Royal Infirmary of Edinburgh, Room S6114 Level 2, 51 Little France Crescent, Edinburgh EH16 4SA, UK

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    We read the short report by Ellis et al with interest.1 However, we are unsure whether they have adequately proved that no significant difference was detected between the two outlined storage methods.

    The hypothesis evaluated with the Wilcoxon matched pairs signed ranks …

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