Prognostic models are often used to estimate the length of patient survival. The Cox proportional hazards model has traditionally been applied to assess the accuracy of prognostic models. However, it may be suboptimal due to the inflexibility to model the baseline survival function and when the proportional hazards assumption is violated. The aim of this study was to use internal validation to ...

The primary objective of this work was to investigate and compare the use of the Cox proportional hazards model and Aalen’s additive model in analysing survival data. Survival data from a study of 52 patients with advanced breast cancer was investigated using the Cox proportional hazards model. The model was optimized by examining different aspects by use of appropriate residual plots. Covariat...

Background: The age at first birth corresponds to the of mother giving child. study aims accessing determinants timing among Ethiopian women.
 Methods: data for this was extracted from published reports Demographic and Health Survey. used15, 683 women aged 15-49 years nine regions two city administrations. Cox Proportional hazards model used identifying factors associated with birth.
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The burden of cancer is increasing very rapidly day by all over the world, largely due to an unhealthy lifestyle. Some cross-sectional studies have been conducted on lifestyle patients based Sylhet city, Bangladesh. However, best our knowledge, no study has done longitudinal aspect considering whole Bangladesh, therefore, we aimed conduct a know effects and heritability in We selected total 384...