Frequencies for first 10,000 rows of first_yr variable in vehicle dataset : First | Accident,et | c-Year | Freq. Percent Cum. ------------+----------------------------------- 0 | 4,273 42.73 42.73 81 | 1,363 13.63 56.36 82 | 1,813 18.13 74.49 83 | 1,363 13.63 88.12 84 | 528 5.28 93.40 99 | 660 6.60 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016