Frequencies for first 10,000 rows of fuel_t variable in vindecode dataset : (fuel) description | Freq. Percent Cum. ---------------------------+----------------------------------- | 1,958 19.58 19.58 Compressed Natural Gas | 8 0.08 19.66 Convertible | 4 0.04 19.70 Diesel | 958 9.58 29.28 Electric | 4 0.04 29.32 Electric and Diesel Hybrid | 2 0.02 29.34 Electric and Gas Hybrid | 118 1.18 30.52 Flexible | 418 4.18 34.70 GAS | 2 0.02 34.72 Gas | 6,527 65.27 99.99 Unknown | 1 0.01 100.00 ---------------------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Oct 2016