Hence there seems to be a significant overall improvement in survival after February 1988. The nonlinear modeling procedures described here are useful for two reasons. First , they help to prevent model misspecification, which can lead to incorrect conclusions regarding treatment efficacy.
Period is highly significant.
Hence there seems to be a significant overall improvement in survival after February 1988. The nonlinear modeling procedures described here are useful for two reasons. First , they help to prevent model misspecification, which can lead to incorrect conclusions regarding treatment efficacy.