Frequencies for first 10,000 rows of prev_acc variable in vehicle dataset : PREVIOUS | ACCIDENTS | Freq. Percent Cum. ------------+----------------------------------- 0 | 7,795 77.95 77.95 1 | 1,296 12.96 90.91 2 | 234 2.34 93.25 3 | 33 0.33 93.58 4 | 5 0.05 93.63 5 | 4 0.04 93.67 98 | 68 0.68 94.35 99 | 492 4.92 99.27 . | 73 0.73 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016