Frequencies for first 10,000 rows of cf3 variable in accident dataset : Accident | Related | Factor 3 | Freq. Percent Cum. ------------+----------------------------------- 0 | 9,729 97.29 97.29 99 | 271 2.71 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016