Frequencies for first 10,000 rows of vin_bt variable in vehicle dataset : vin_bt | Freq. Percent Cum. ------------+----------------------------------- | 103 1.03 1.03 2D | 373 3.73 4.76 2F | 7 0.07 4.83 2H | 643 6.43 11.26 2L | 64 0.64 11.90 2P | 4 0.04 11.94 2T | 277 2.77 14.71 2W | 6 0.06 14.77 3D | 30 0.30 15.07 4D | 1,926 19.26 34.33 4H | 194 1.94 36.27 4L | 8 0.08 36.35 4P | 20 0.20 36.55 4T | 38 0.38 36.93 4W | 18 0.18 37.11 99 | 789 7.89 45.00 AT | 17 0.17 45.17 BU | 6 0.06 45.23 CB | 76 0.76 45.99 CC | 51 0.51 46.50 CG | 18 0.18 46.68 CH | 3 0.03 46.71 CL | 1 0.01 46.72 CP | 1,118 11.18 57.90 CV | 88 0.88 58.78 CY | 10 0.10 58.88 DP | 1 0.01 58.89 DS | 284 2.84 61.73 EC | 3 0.03 61.76 ES | 2 0.02 61.78 EV | 3 0.03 61.81 EW | 1 0.01 61.82 FB | 8 0.08 61.90 FC | 11 0.11 62.01 GL | 5 0.05 62.06 HB | 11 0.11 62.17 HT | 2 0.02 62.19 IC | 39 0.39 62.58 IE | 5 0.05 62.63 LB | 14 0.14 62.77 LL | 1 0.01 62.78 LM | 1 0.01 62.79 MH | 7 0.07 62.86 MM | 2 0.02 62.88 MS | 13 0.13 63.01 MX | 5 0.05 63.06 MY | 10 0.10 63.16 NB | 8 0.08 63.24 PC | 127 1.27 64.51 PD | 1 0.01 64.52 PK | 1,667 16.67 81.19 PS | 78 0.78 81.97 RD | 7 0.07 82.04 RS | 485 4.85 86.89 RT | 13 0.13 87.02 S2 | 18 0.18 87.20 SD | 35 0.35 87.55 SN | 3 0.03 87.58 SV | 186 1.86 89.44 SW | 339 3.39 92.83 T | 1 0.01 92.84 TB | 43 0.43 93.27 TL | 65 0.65 93.92 TM | 77 0.77 94.69 UT | 356 3.56 98.25 VN | 169 1.69 99.94 VW | 1 0.01 99.95 XT | 1 0.01 99.96 YY | 4 0.04 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016