list all factor levels of a data.frame

Question

with str(data) I get the headof the levels (1-2 values)

fac1: Factor w/ 2  levels ... :
fac2: Factor w/ 5  levels ... :
fac3: Facto         


        

Answer 1

Alternate option to get length of levels in a 'data'.frame:

data_levels_length <- sapply(seq(1, ncol(data)), function(x){
  length(levels(data[,x]))
})