ISOTONIC WINDOW ESTIMATORS OF THE BASE-LINE HAZARD FUNCTION IN COXS REGRESSION-MODEL UNDER ORDER RESTRICTION

The regression model suggested by Cox (1972) has been widely used in s urvival analysis with censored observations. We propose isotonic windo w estimators for a monotone baseline hazard function in the Cox regres sion model. We prove that these estimators are asymptotically normal. The simulation results presented in the article suggest that the propo sed estimator performs better than several existing estimators in the literature.