This function is the opposite of remove_bogus(). Instead of removing bots,
duplicates, and speedster from a data frame, it keeps them. This was designed to
make it easy to send to survey panel providers so they can remove them from
your data set.
Arguments
- data
A data.frame object you want to operate on
- duration
The name of the time duration variable. Must be a string.
- cut_off
Specify what percentage of the median time should be used to remove speedsters. Default is 0.3, which means people who's time to complete is 0.3 that of the median completion time are removed.