grouping categorical variables in R

Question

Suppose I have a variable named 'Fever' in which I have 4 options like mild, moderate, severe and very severe. I want to club moderate and mild together and severe and very severe together, how can I do it in 'R'?

Please suggest

question from:https://stackoverflow.com/questions/65882574/grouping-categorical-variables-in-r

Answer 1

I think you're looking for something like this:

library(tidyverse)
df <- tibble(fever = c("mild","moderate","severe","very severe"))
newdf <- mutate(df,highfever = case_when(fever == "mild" | fever == "moderate" ~ 0,
                                         fever == "severe" | fever == "very severe" ~ 1))