Statistics and the M.R.C.PBr Med J 1973; 4 doi: https://doi.org/10.1136/bmj.4.5889.421 (Published 17 November 1973) Cite this as: Br Med J 1973;4:421
Log in using your username and password
Log in through your institution
Register for a free trial to thebmj.com to receive unlimited access to all content on thebmj.com for 14 days.
Sign up for a free trial