In many populations, factors can be recognized the presence of which increases the population heterogeneity. Especially when the factors are categorical (say, male/female or species of trees), it is common to break the population into subpopulations. But for factors such as blood pressure or age, the consideration of subpopulations may not be practical, and an alternative approach is to make use of covariate models.
KeywordsHazard Rate Survival Function Covariate Model Proportional Odds Model Generalize Gamma Distribution
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