Chen, Ming-Hui; Ibrahim, Joseph G.; Shao, Qi-Man - In: Journal of Multivariate Analysis 100 (2009) 9, pp. 2018-2030
In this paper, we carry out an in-depth theoretical investigation for existence of maximum likelihood estimates for the Cox model [D.R. Cox, Regression models and life tables (with discussion), Journal of the Royal Statistical Society, Series B 34 (1972) 187-220; D.R. Cox, Partial likelihood,...