1step,rule,n_before,n_after,n_removed,rationale21,first row has no previous row for a one-day change,2498,2497,1,change defined as 100*(y_t - y_{t-1}) between consecutive rows32,keep post_cut=1 days and the 120 rows preceding the first post_cut=1 day,2497,0,2497,estimand windows; no post_cut=1 rows exist so no window can be formed4