1step,rule,n_before,n_after,n_removed,rationale21,load file,2498,2498,0,all rows read; no missing values or duplicates32,first difference (first row has no t-1),2498,2497,1,one-day change undefined for first row; remaining changes form baseline sample43,keep post_cut=1 days and the 120 rows before the first flagged day,2497,0,2497,"no flagged day exists, so the estimation windows are empty"5