Dear all, Is there 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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