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Báo cáo y học: "Statistics review 3: Hypothesis testing and P values"

Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Critical Care giúp cho các bạn có thêm kiến thức về y học đề tài: Statistics review 3: Hypothesis testing and P values. | Available online http ccforum.eom content 7 1 15 Erratum Statistics review 3 Hypothesis testing and P values Elise Whitley1 and Jonathan Ball2 Lecturer in Medical Statistics University of Bristol UK 2Lecturer in Intensive Care Medicine St George s Hospital Medical School London UK Correspondence Editorial Office Critical Care editorial@ccforum.com Published online 13 December 2002 Critical Care 2003 7 15 DOI 10.1186 cc1868 This article is online at http ccforum.com content 7 1 15 2003 BioMed Central Ltd Print ISSN 1364-8535 Online ISSN 1466-609X An erratum to Statistics review 3 Hypothesis testing and P values by Elise Whitley and Jonathan Ball. In the original version of this article 1 the words if the null hypothesis is true were omitted from the first sentence of the first key message. The key message should have read as follows A P value is the probability that an observed effect is simply due to chance if the Null hypothesis is true it therefore provides a measure of the strength of an association. A P value does not provide any measure of the size of an effect and cannot be used in isolation to inform clinical judgement. References 1. Whitley E Ball J Statistics review 3 Hypothesis testing and Pvalues. Crit Care 2002 6 222-225. .