Four types of estimation approaches for prognostic survival oral cancer model building are considered via a SAS algorithm: Efron’s Method, Exact Method, Breslow’s Method, and Discrete Method. Each method is illustrated separately and compared according to their coefficient parameter. An approach is considered by adding a bootstrapping technique for each handling ties method and a complete SAS algorithm is supplied for each proposed method, including methods for handling ties.
Amir, W. M., Azeem, M., Harun, M. H., Ali, Z., & Shafiq, M. (2019). JMASM 54: A comparison of four different estimation approaches for prognostic survival oral cancer model. Journal of Modern Applied Statistical Methods, 18(2), eP2823. doi: 10.22237/jmasm/1604189760