Dear all, there is a best way to do the following task?
x = rep(c("A","B"),5)
y = rnorm(10)
data = data.frame(x,y)
data$y[1:2] = c(NA,NA)
means = ave(data$y,as.character(data$x),FUN=function(x)mean(x,na.rm=T))
aux = which(is.na(data$y))
data[aux,"y"] = means[aux]
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