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...the summary is, how much influence might the NA's have had, if they were included, and is excluding them from the means causing some sort of bias. So I want the summary stat for the NA's also. Here is a simple example session (edited to remove the typos I made, comments added later): > tmp_a <- 1:10 > tmp_b <- rep(1:5,2) > tmp_c <- rep(1:2,5) > tmp_d <- c(1,1,1,2,2,2,3,3,3,4) > tmp_df <- data.frame(tmp_a,tmp_b,tmp_c,tmp_d); > tmp_df$tmp_c[9:10] <- NA ; > tmp_df tmp_a tmp_b tmp_c tmp_d 1 1 1 1 1 2 2 2 2 1 3 3...