[Solved] To get the most frequent levels in a data frame

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You can do something like this with dplyr

set.seed(43)
df<-data.frame(location=sample(LETTERS[1:3],20,replace=TRUE),
               site=sample(c("bang","mys","hubl","dar"),20,replace=TRUE))

library(dplyr)
df%>%group_by(location,site)%>%summarize(Count=n())%>%arrange(desc(Count))%>%slice(1)%>%ungroup()%>%select(location,site)

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solved To get the most frequent levels in a data frame