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  1. library(dplyr)
  2.  
  3. data.frame(team=rep(c(1,2,3),3),A20=sample(1:100,9))->dat
  4. dat %>% group_by(team) %>% mutate(mean=mean(A20),sd=sd(A20)) %>% mutate(zscore=(A20-mean)/sd)->dat
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