Frequencies for first 10,000 rows of tkbrak variable in vindecode dataset : (brake | type) the | type of | brakes on | the vehicle | (currently | commercial | truck only) | Freq. Percent Cum. ------------+----------------------------------- | 5,731 57.31 57.31 AIR | 645 6.45 63.76 AOH | 3 0.03 63.79 H/V | 2 0.02 63.81 HYD | 2,417 24.17 87.98 U | 1,202 12.02 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Oct 2016