Wendy M. Gibson, Geoffrey H. Jowett, `Three-Group' Regression Analysis: Part I. Simple Regression Analysis, Journal of the Royal Statistical Society. Series C (Applied Statistics), Vol. 6, No. 2 (Jun., 1957), pp. 114-122
No takes yet. Share an insight, caveat, or question.
Gibson et al. (1957) studied this question.
Synapse has enriched 2 closely related papers on similar clinical questions. Consider them for comparative context: