Randomly insert NAs into dataframe proportionaly

Question

I have a complete dataframe. I want to 20% of the values in the dataframe to be replaced by NAs to simulate random missing data.

A <- c(1:10)
B <- c(1         


        

Answer 1

You can unlist the data.frame and then take a random sample, then put back in a data.frame.

df <- unlist(df)
n <- length(df) * 0.15
df[sample(df, n)] <- NA
as.data.frame(matrix(df, ncol=3))

It can be done a bunch of different ways using sample().