Frequencies for a_imp1 variable in veh_aux dataset : Intial | Impact | Point | Freq. Percent Cum. ------------+----------------------------------- 1 | 19 2.45 2.45 2 | 555 71.52 73.97 3 | 67 8.63 82.60 4 | 56 7.22 89.82 5 | 78 10.05 99.87 6 | 1 0.13 100.00 ------------+----------------------------------- Total | 776 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016