Frequencies for first 10,000 rows of vin_bt variable in vehicle dataset : vin_bt | Freq. Percent Cum. ------------+----------------------------------- | 3 0.03 0.03 2D | 56 0.56 0.59 2H | 181 1.81 2.40 2L | 19 0.19 2.59 2P | 13 0.13 2.72 2T | 8 0.08 2.80 2W | 50 0.50 3.30 3C | 54 0.54 3.84 3D | 1 0.01 3.85 3P | 12 0.12 3.97 4B | 3 0.03 4.00 4C | 351 3.51 7.51 4D | 2,725 27.25 34.76 4H | 87 0.87 35.63 4P | 18 0.18 35.81 4W | 279 2.79 38.60 5D | 6 0.06 38.66 99 | 478 4.78 43.44 AC | 1 0.01 43.45 AT | 38 0.38 43.83 BU | 25 0.25 44.08 C4 | 3 0.03 44.11 CB | 52 0.52 44.63 CC | 59 0.59 45.22 CG | 42 0.42 45.64 CH | 2 0.02 45.66 CP | 540 5.40 51.06 CV | 105 1.05 52.11 CW | 428 4.28 56.39 DS | 422 4.22 60.61 EC | 20 0.20 60.81 EN | 7 0.07 60.88 ES | 98 0.98 61.86 FC | 4 0.04 61.90 GG | 2 0.02 61.92 GL | 3 0.03 61.95 IC | 33 0.33 62.28 IE | 4 0.04 62.32 LB | 31 0.31 62.63 LL | 4 0.04 62.67 MH | 5 0.05 62.72 MP | 1 0.01 62.73 MS | 10 0.10 62.83 MX | 12 0.12 62.95 MY | 9 0.09 63.04 PC | 283 2.83 65.87 PK | 549 5.49 71.36 PS | 68 0.68 72.04 RC | 26 0.26 72.30 RD | 8 0.08 72.38 RS | 876 8.76 81.14 RT | 11 0.11 81.25 S2 | 6 0.06 81.31 SV | 311 3.11 84.42 SW | 109 1.09 85.51 T | 4 0.04 85.55 TB | 28 0.28 85.83 TL | 13 0.13 85.96 TM | 40 0.40 86.36 UT | 1,338 13.38 99.74 VN | 13 0.13 99.87 YY | 13 0.13 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016