df<-data.frame(id=c(1:20),name=c('a','b','b','c','a','d','b','e','d','d','c','a','b','a','a','b','f','b','c','g'))
freq <- ave(rep(1, times=nrow(df)), df$name, FUN=sum)
rowSums(table(df$name,freq))
--
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