Frequencies for vin_bt variable in vehicle dataset : vin_bt | Freq. Percent Cum. ------------+----------------------------------- | 12 1.68 1.68 2D | 50 6.98 8.66 2H | 66 9.22 17.88 2L | 6 0.84 18.72 2T | 3 0.42 19.13 2W | 1 0.14 19.27 4D | 147 20.53 39.80 4H | 9 1.26 41.06 4P | 2 0.28 41.34 4W | 45 6.28 47.63 99 | 103 14.39 62.01 BU | 2 0.28 62.29 CB | 4 0.56 62.85 CC | 8 1.12 63.97 CG | 8 1.12 65.08 CP | 90 12.57 77.65 CV | 6 0.84 78.49 DP | 2 0.28 78.77 DS | 1 0.14 78.91 EC | 1 0.14 79.05 FB | 2 0.28 79.33 FC | 1 0.14 79.47 GL | 1 0.14 79.61 HT | 1 0.14 79.75 IC | 3 0.42 80.17 IE | 1 0.14 80.31 LB | 1 0.14 80.45 MP | 1 0.14 80.59 NB | 2 0.28 80.87 PC | 8 1.12 81.98 PK | 43 6.01 87.99 PS | 1 0.14 88.13 RS | 20 2.79 90.92 RT | 1 0.14 91.06 SD | 4 0.56 91.62 SV | 10 1.40 93.02 SW | 18 2.51 95.53 TB | 1 0.14 95.67 TL | 2 0.28 95.95 TM | 3 0.42 96.37 UT | 20 2.79 99.16 VN | 6 0.84 100.00 ------------+----------------------------------- Total | 716 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016