Frequencies for a_imp2 variable in veh_aux dataset : Principal | Impact | Point | Freq. Percent Cum. ------------+----------------------------------- 1 | 19 2.45 2.45 2 | 532 68.56 71.01 3 | 66 8.51 79.51 4 | 51 6.57 86.08 5 | 75 9.66 95.75 6 | 33 4.25 100.00 ------------+----------------------------------- Total | 776 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016