BMJ. 1999 Jun 19;318(7199):1667.
Statistics notes: variables and parameters.
Altman DG, Bland JM.
ICRF Medical Statistics Group, Centre for Statistics in Medicine, Institute of Health Sciences, Oxford OX3 7LF.
PMID: 10373171 [PubMed - indexed for MEDLINE]
PMCID: 1116021
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