R - how to create a loop for different categories in a column in r

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how to create a loop for different categories in a column in r

nm1 <- unique(s$flavor)
for(i in seq_along(unique(s$flavor))){
    tmp <- s$age[s$flavor == nm1[i] ]
    v1[i] <-paste("mean =", mean(tmp), "sd =", sd(tmp))
  }

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how to create a loop for different categories in a column in r

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