Frequencies for first 10,000 rows of abs_t variable in vindecode dataset : (brakes- abs | code) | description | Freq. Percent Cum. ---------------+----------------------------------- | 2,798 27.98 27.98 ALL WHEEL STD | 2 0.02 28.00 All Wheel Opt | 996 9.96 37.96 All Wheel Std | 5,143 51.43 89.39 N/A | 343 3.43 92.82 Other Opt | 203 2.03 94.85 Other Std | 206 2.06 96.91 Rear Wheel Opt | 30 0.30 97.21 Rear Wheel Std | 243 2.43 99.64 Unknown | 36 0.36 100.00 ---------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Oct 2016