Frequencies for first 10,000 rows of vin_bt variable in vehicle dataset : vin_bt | Freq. Percent Cum. ------------+----------------------------------- | 386 3.86 3.86 2D | 336 3.36 7.22 2F | 3 0.03 7.25 2H | 674 6.74 13.99 2L | 58 0.58 14.57 2P | 5 0.05 14.62 2T | 186 1.86 16.48 2W | 15 0.15 16.63 3D | 24 0.24 16.87 4D | 2,081 20.81 37.68 4H | 167 1.67 39.35 4L | 8 0.08 39.43 4P | 15 0.15 39.58 4T | 18 0.18 39.76 4W | 78 0.78 40.54 99 | 502 5.02 45.56 AC | 1 0.01 45.57 AT | 12 0.12 45.69 BU | 9 0.09 45.78 CB | 109 1.09 46.87 CC | 60 0.60 47.47 CG | 26 0.26 47.73 CL | 2 0.02 47.75 CP | 1,018 10.18 57.93 CV | 80 0.80 58.73 CW | 20 0.20 58.93 CY | 4 0.04 58.97 DP | 3 0.03 59.00 DS | 320 3.20 62.20 EC | 9 0.09 62.29 EN | 1 0.01 62.30 ES | 3 0.03 62.33 EV | 1 0.01 62.34 EW | 2 0.02 62.36 FB | 11 0.11 62.47 FC | 4 0.04 62.51 GL | 4 0.04 62.55 HB | 3 0.03 62.58 HT | 2 0.02 62.60 IC | 53 0.53 63.13 IE | 6 0.06 63.19 LB | 11 0.11 63.30 LL | 4 0.04 63.34 MH | 5 0.05 63.39 MK | 3 0.03 63.42 MP | 3 0.03 63.45 MS | 3 0.03 63.48 MX | 4 0.04 63.52 MY | 15 0.15 63.67 NB | 8 0.08 63.75 PC | 183 1.83 65.58 PK | 1,504 15.04 80.62 PS | 88 0.88 81.50 RD | 5 0.05 81.55 RS | 389 3.89 85.44 RT | 10 0.10 85.54 S2 | 22 0.22 85.76 SC | 1 0.01 85.77 SD | 33 0.33 86.10 SN | 9 0.09 86.19 SV | 287 2.87 89.06 SW | 310 3.10 92.16 T | 1 0.01 92.17 TB | 48 0.48 92.65 TL | 46 0.46 93.11 TM | 72 0.72 93.83 UT | 469 4.69 98.52 VD | 1 0.01 98.53 VN | 139 1.39 99.92 VW | 4 0.04 99.96 WW | 1 0.01 99.97 XT | 2 0.02 99.99 YY | 1 0.01 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016