Statistics Notes: Validating scales and indexes.
Bland
J Martin
JM
Department of Public Health Sciences, St George's Hospital Medical School, London SW17 0RE. mbland@sghms.ac.uk
Altman
Douglas G
DG
D006305:Health Status Indicators; D006801:Humans; D015203:Reproducibility of Results; D013223:Statistics as Topic / Q000379:methods*