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

We need to get the sum of 'FREQUENCY' and check whether it is greater than 5 in the filter after grouping by 'HEADWORD'

Words1 %>% 
     group_by(HEADWORD) %>% 
     filter(sum(FREQUENCY) >5)   
#   HEADWORD VARIANT FREQUENCY
#     <chr>   <chr>     <int>
#1   KNIGHT  knight         6
#2   KNIGHT   kniht         2 
#3   KNIGHT    knyt         1

Answer 2

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