Efficient Computation of Subset Selection Probabilities with Application to Cox Regression
David M. DeLong, George H. Guirguis, Ying So · Biometrika · 1994
An efficient method is presented to compute the probability of selection of a specified subset from the set of all subsets of a fixed size where the subsets are taken from a population whose units have varying individual probabilities of selection. The problem is motivated by the computation of the exact marginal likelihood for the Cox proportional hazards model.