Frequencies for first 10,000 rows of vin_bt variable in vehicle dataset : vin_bt | Freq. Percent Cum. ------------+----------------------------------- | 305 3.05 3.05 2D | 351 3.51 6.56 2H | 636 6.36 12.92 2L | 60 0.60 13.52 2P | 5 0.05 13.57 2T | 138 1.38 14.95 2W | 25 0.25 15.20 3D | 19 0.19 15.39 4D | 2,219 22.19 37.58 4H | 134 1.34 38.92 4L | 11 0.11 39.03 4P | 20 0.20 39.23 4T | 13 0.13 39.36 4W | 65 0.65 40.01 5D | 1 0.01 40.02 8V | 1 0.01 40.03 99 | 470 4.70 44.73 AT | 12 0.12 44.85 BU | 6 0.06 44.91 CB | 90 0.90 45.81 CC | 82 0.82 46.63 CG | 22 0.22 46.85 CH | 1 0.01 46.86 CL | 1 0.01 46.87 CP | 1,042 10.42 57.29 CV | 85 0.85 58.14 CW | 22 0.22 58.36 CY | 12 0.12 58.48 DP | 2 0.02 58.50 DS | 333 3.33 61.83 EC | 7 0.07 61.90 EN | 1 0.01 61.91 ES | 7 0.07 61.98 EV | 1 0.01 61.99 EW | 1 0.01 62.00 FB | 8 0.08 62.08 FC | 5 0.05 62.13 GG | 1 0.01 62.14 GL | 4 0.04 62.18 HB | 4 0.04 62.22 HT | 4 0.04 62.26 IC | 54 0.54 62.80 IE | 6 0.06 62.86 LB | 9 0.09 62.95 LL | 7 0.07 63.02 MH | 5 0.05 63.07 MS | 11 0.11 63.18 MX | 6 0.06 63.24 MY | 15 0.15 63.39 NB | 8 0.08 63.47 PC | 233 2.33 65.80 PK | 1,566 15.66 81.46 PS | 119 1.19 82.65 RD | 3 0.03 82.68 RS | 340 3.40 86.08 RT | 11 0.11 86.19 S2 | 23 0.23 86.42 SD | 14 0.14 86.56 SN | 4 0.04 86.60 SV | 291 2.91 89.51 SW | 265 2.65 92.16 T | 2 0.02 92.18 TB | 41 0.41 92.59 TL | 55 0.55 93.14 TM | 77 0.77 93.91 UT | 472 4.72 98.63 VD | 1 0.01 98.64 VN | 130 1.30 99.94 VW | 2 0.02 99.96 YY | 4 0.04 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016