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Missing _predicted_median
@CamDavidsonPilon, same example in documentation (pg 94), the model ggf.concondance_index_ shows this error:
AttributeError: 'GeneralizedGammaRegressionFitter' object has no attribute '_predicted_median'
Originally posted by @shantanuneema in https://github.com/CamDavidsonPilon/lifelines/discussions/1401#discussioncomment-2296825