Frequencies for first 10,000 rows of vin_bt variable in vehicle dataset : vin_bt | Freq. Percent Cum. ------------+----------------------------------- | 218 2.18 2.18 2D | 280 2.80 4.98 2F | 3 0.03 5.01 2H | 563 5.63 10.64 2L | 53 0.53 11.17 2P | 11 0.11 11.28 2T | 78 0.78 12.06 2W | 41 0.41 12.47 3C | 19 0.19 12.66 3D | 11 0.11 12.77 4D | 2,421 24.21 36.98 4H | 104 1.04 38.02 4L | 5 0.05 38.07 4P | 29 0.29 38.36 4T | 12 0.12 38.48 4W | 131 1.31 39.79 8V | 1 0.01 39.80 99 | 493 4.93 44.73 AT | 16 0.16 44.89 BU | 3 0.03 44.92 CB | 80 0.80 45.72 CC | 90 0.90 46.62 CG | 26 0.26 46.88 CH | 2 0.02 46.90 CP | 884 8.84 55.74 CV | 87 0.87 56.61 CW | 20 0.20 56.81 CY | 2 0.02 56.83 DP | 3 0.03 56.86 DS | 416 4.16 61.02 EC | 10 0.10 61.12 ES | 6 0.06 61.18 EV | 4 0.04 61.22 EW | 1 0.01 61.23 FB | 7 0.07 61.30 FC | 6 0.06 61.36 GL | 4 0.04 61.40 HB | 1 0.01 61.41 HT | 1 0.01 61.42 IC | 54 0.54 61.96 IE | 13 0.13 62.09 LB | 5 0.05 62.14 LL | 6 0.06 62.20 MH | 4 0.04 62.24 MP | 2 0.02 62.26 MR | 1 0.01 62.27 MS | 5 0.05 62.32 MX | 8 0.08 62.40 MY | 16 0.16 62.56 NB | 5 0.05 62.61 PC | 311 3.11 65.72 PK | 1,384 13.84 79.56 PS | 125 1.25 80.81 RD | 7 0.07 80.88 RS | 382 3.82 84.70 RT | 5 0.05 84.75 S1 | 1 0.01 84.76 S2 | 25 0.25 85.01 SD | 6 0.06 85.07 SN | 1 0.01 85.08 SV | 345 3.45 88.53 SW | 274 2.74 91.27 T | 1 0.01 91.28 TB | 32 0.32 91.60 TL | 55 0.55 92.15 TM | 84 0.84 92.99 UT | 568 5.68 98.67 VD | 1 0.01 98.68 VN | 123 1.23 99.91 WW | 1 0.01 99.92 YY | 8 0.08 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016