Figure 3From: Family history of the cancer on the survival of the patients with gastrointestinal cancer in northern Iran, using frailty models Cox-Snell residuals obtained from fitting various survival models with gamma frailty to the GI tract cancer data. The panels indicate the Cox-Snell residuals (together with their cumulative hazard function) obtained from fitting different parametric models to the same data via maximum likelihood estimation.Back to article page