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I want to model time to churn with a Cox Proportional Hazard model and use it to predict people likely to churn. The question I have is how valid is to calibrate the model with the same people I want to forecast, is't it going to be biased or over-fitted? Just to be clear the data I have is mainly people and their time to churn and people that has not churn. This last group (the people that hasn't churn) is exactly the one that I want to forecast their hazard and time to churn.

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