fill_run                Fill NA with previous non-NA element
lag_run                 Lag dependent on variable
length_run              Length of running windows
max_run                 Running minimum
mean_run                Running mean
min_run                 Running minimum
streak_run              Running streak length
sum_run                 Running sum
unique_run              List of running windows
whichd_run              Index of previous, different element
whicht_run              Running which-true function
window_run              List of running windows
