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Extracts the product-limit table from a survfit object for a given stratum. Only survival::survfit() and unstratified survival::survfit.coxph() objects are supported.
survival::survfit()
survival::survfit.coxph()
extract_stratum(sf, index)
A data frame of the product-limit table for the given stratum.
A survit object.
The index number of the strata to extract.