Filter group of rows based on sum of values from different column

Question

I\'m trying to filter out whole rows in R, but only if the frequencies for a particular set don\'t add up to more than 5.

The data I have looks a bit like this. It\'s

Answer 1

You can use base R ave function

df[ave(df$FREQUENCY, df$HEADWORD, FUN = sum) > 5, ]

#   HEADWORD VARIANT FREQUENCY
#4   KNIGHT  knight         6
#5   KNIGHT   kniht         2
#6   KNIGHT    knyt         1