see ?tapply, for example: tapply(df$x, df$z, mean)
Might also look at ?ave and ?aggregate depending on what form you want the result to have... or the "plyr" package on CRAN. Lots of options!
stat4u wrote:
hi, How can i calculate means with catergory of variable... like x y z 2 3 y 3 4 n 1 2 y 6 3 n 9 1 y 2 2 n 8 3 y i want to get mean of x and y with respective to its category(y,n) thanks... regards, Muhammad Faisal
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