Non-parametric testsBMJ 2009; 338 doi: https://doi.org/10.1136/bmj.b781 (Published 05 March 2009) Cite this as: BMJ 2009;338:b781
- John Fletcher, clinical epidemiologist
- 1BMJ, London WC1H 9JR
Which if any of the following statements are false?
a) Non-parametric statistics may be used for normally distributed data
b) Correlation coefficients are inappropriate for non-normally distributed data
c) Medians are always a more valid way than means are to compare non-normally distributed data
d) The significance level of a test should be …