How to add a percentage column to each dataset of a list?

Question

I have this dataset (let's imagine it with 900 variables ) and the list l2 as follows :

df = data.frame(x = c(1,0,0,0,1,1,1), y = c(2,2,2,2,3,3,2) )

l1 = lapply(df,table)

l2 = lapply(l1,as.data.frame)

I wish to add a percentage column to each of these dataframes based on the Freq column of each dataframe. Appreciate the help.

Answer 1

You can use proportions:

lapply(df, \(x) transform(as.data.frame(table(x)), prop = proportions(Freq)))

$x
  x Freq      prop
1 0    3 0.4285714
2 1    4 0.5714286

$y
  x Freq      prop
1 2    5 0.7142857
2 3    2 0.2857143