Nothing
Impute.h <-
function(x){
h <- data.frame(x[, colnames(x)[grep("h", colnames(x))]])
delta <- apply(h, 2, function(x) ifelse(is.na(x), 0, 1))
h[is.na(h)] <- 0
x[, colnames(h)] <- h
return(data.frame(x, delta))
}
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