Corregido error en ejemplo.

man/perc.Rd

@@ -18,8 +18,8 @@ perc(v)
 # It can be used with dplyr tables
 library(tidyverse)
 df<-data.frame("X"=c("A","A","B","B"), "Y"=v)
-df \%>\% group_by(X) \%>\% summarise(Y=perc(Y))
+df \%>\% mutate(Y=perc(Y))
 
 # Or it can be under 1
-df \%>\% group_by(X) \%>\% summarise(Y=perc(Y, per100=F))
+df \%>\% mutate(Y=perc(Y, per100=F))
 }