R 变量的值标签

我想在数据框中的变量（0=“Male”和1=“Female”）上附加一个值标签

我试过这个：

CB$gender <- factor(CB$gender, levels = c(0,1), labels = c("Male", "Female"))

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有什么想法吗？

我不知道怎么回事，但像这样把它分开似乎很有效

 gender<-c("Male","Female","Male","Female")

 gender <- as.factor(gender)

 levels(gender)<-c(0,1)

性别
 gender<-c("Male","Female","Male","Female")

 gender <- as.factor(gender)

 levels(gender)<-c(0,1)

gender<-CB$gender