Intended for healthcare professionals


Statistics for the non-statistician. I: Different types of data need different tests

BMJ 1997; 315 doi: (Published 13 September 1997) Cite this as: BMJ 1997;315:675

An author's error appeared in this article by Trisha Greenhalgh (9 August, pp 364-6). In table 1, the χ2 test is listed as a parametric test. In fact, both the χ2 test and Fisher's exact test are non-parametric.