The CoxPHFitter class is a part of the lifelines library in Python. It is used for fitting a Cox proportional hazards regression model on survival data. This model is widely used in the field of survival analysis to analyze the relationship between the covariates (independent variables) and the hazard rate (risk of an event occurring) in survival data. The CoxPHFitter class allows the user to estimate regression coefficients and perform statistical inference on the impact of different covariates on survival times. It provides various methods and attributes to analyze and interpret the results obtained from the Cox proportional hazards regression model.
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