Asymptotic validity of Schoenfeld’s sample size formula for the Cox proportional hazards model via the Wald test approach
Statistical Methods in Medical Research: An International Review Journal
Published online on March 23, 2026
Abstract
Statistical Methods in Medical Research, Volume 35, Issue 4, Page 681-694, April 2026.
We revisit the widely used sample size formula for the Cox proportional hazards model, originally proposed by Schoenfeld in 1983. The classical derivation, based on the score test, evaluates the Fisher information under the null hypothesis, overlooking ...
We revisit the widely used sample size formula for the Cox proportional hazards model, originally proposed by Schoenfeld in 1983. The classical derivation, based on the score test, evaluates the Fisher information under the null hypothesis, overlooking ...