CorrelationBMJ 2009; 339 doi: http://dx.doi.org/10.1136/bmj.b2578 (Published 01 July 2009) Cite this as: BMJ 2009;339:b2578
- John Fletcher, clinical epidemiologist
- 1BMJ, London WC1H 9JR
Which of the following, if any, does not measure correlation?
a) Kendall’s τ
b) Spearman’s ρ
c) Cronbach’s α
d) Pearson’s r
None—These are all measures of correlation. Kendall’s τ is a non-parametric measure of correlation that involves measuring the degree of correspondence in rank order between two variables. Spearman’s ρ is also a non-parametric measure of correlation based on rank order. Both methods have …
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