Frequencies for vin_bt variable in vehicle dataset : vin_bt | Freq. Percent Cum. ------------+----------------------------------- | 43 5.63 5.63 2D | 56 7.33 12.96 2H | 76 9.95 22.91 2L | 11 1.44 24.35 2T | 5 0.65 25.00 2W | 1 0.13 25.13 4D | 159 20.81 45.94 4H | 2 0.26 46.20 4W | 4 0.52 46.73 8V | 1 0.13 46.86 99 | 98 12.83 59.69 BU | 1 0.13 59.82 CB | 5 0.65 60.47 CC | 5 0.65 61.13 CG | 4 0.52 61.65 CP | 100 13.09 74.74 CV | 4 0.52 75.26 CW | 1 0.13 75.39 DP | 2 0.26 75.65 DS | 2 0.26 75.92 EC | 4 0.52 76.44 FB | 1 0.13 76.57 FC | 1 0.13 76.70 IC | 2 0.26 76.96 IE | 1 0.13 77.09 LB | 2 0.26 77.36 MS | 1 0.13 77.49 MY | 1 0.13 77.62 NB | 3 0.39 78.01 PC | 3 0.39 78.40 PK | 41 5.37 83.77 PS | 2 0.26 84.03 RS | 24 3.14 87.17 SD | 5 0.65 87.83 SV | 10 1.31 89.14 SW | 24 3.14 92.28 TB | 1 0.13 92.41 TM | 5 0.65 93.06 UT | 42 5.50 98.56 VN | 10 1.31 99.87 VW | 1 0.13 100.00 ------------+----------------------------------- Total | 764 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016