Да, вам просто нужно изменить порядок уровней в столбце фактора Class
, сделав WT
вашим первым уровнем:
df$Class <- factor(df$Class, levels = c("WT","MutantA","MutantB","MutantC"))
# or using Gregor's comment:
df$Class = relevel(df$Class, ref = "WT")
coxph(Surv(Time, Status)~Class, data = df)
Call:
coxph(formula = Surv(Time, Status) ~ Class, data = df)
coef exp(coef) se(coef) z p
ClassMutantA -0.557 0.573 0.406 -1.37 0.171
ClassMutantB -0.688 0.503 0.395 -1.74 0.082
ClassMutantC -0.689 0.502 0.401 -1.72 0.085