The CoxPHFitter is a module within the Python library called lifelines. It is used for fitting and estimating Cox proportional hazard models, which are commonly used in survival analysis. The CoxPHFitter allows users to analyze survival data and determine the impact of various covariates on the hazard rate, i.e., the risk of an event occurring over time. This module provides functionality for model training, predicting survival probabilities, computing hazard ratios, and performing statistical tests. It is a powerful tool for analyzing time-to-event data and making predictions based on covariates.
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