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Suppose that we want to obtain the predicted survival function for a specific time range and age value. The time variables used by predict to calculate the survival function are stored in variables t and t0, as established by stset. Before making any changes, we must first create a copy of these time variables and of our covariate age. We can use the clonevar command to create a copy. The advantage of using clonevar over generate is that clonevar creates an exact replica of each original variable, including its labels and other properties.

Stata Tip 94: Manipulation of Prediction Parameters for Parametric Survival Regression Models