A. N. Pettitt, I. Bin Daud, Investigating Time Dependence in Cox's Proportional Hazards Model, Journal of the Royal Statistical Society. Series C (Applied Statistics), Vol. 39, No. 3 (1990), pp. 313-329
No takes yet. Share an insight, caveat, or question.
Pettitt et al. (1990) studied this question.
Synapse has enriched 3 closely related papers on similar clinical questions. Consider them for comparative context: