Hello!
I would like to sample 5 % of cases and from 1 to 3 variables within selected
cases and set them as NA (MCAR-Missing completely at random). I managed to
sample cases and variables, but I donât know how to set them as NA.
R code:
N <- 1000 Â Â Â Â Â ####number of cases
n <- 12 Â Â Â Â Â Â Â Â Â Â ####number of variables
X <- matrix(rnorm(N * n), N, n)Â Â Â ####matrix
pMiss <- 0.05Â Â Â Â ####percent of missing values
idMiss <- sample(1:N, N * pMiss)Â Â Â ####sample cases
nMiss <- length(idMiss)
m <- 3Â Â Â ####maximum number of missing variables within selected cases
howmanyMiss <- sapply(idMiss, function(x) sample(1:m, 1))
howmanyMiss
lapply(howmanyMiss, function(x) sample(1:n, x))
Â
Any suggestion?
Thanks,
Blaž
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