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ShixiangWang / regport

Regression Model Processing Port
https://shixiangwang.github.io/regport/
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交互项处理 #5

Open ShixiangWang opened 2 years ago

ShixiangWang commented 2 years ago 
library(survival)

lung
str(lung)

summary(coxph(Surv(time, status) ~ factor(ph.ecog) * factor(sex), data = lung))
ShixiangWang commented 2 years ago

factor(ph.ecog)3:factor(sex)2 NA NA NA NA

会有NA值