Frequencies for first 10,000 rows of vin_bt variable in vehicle dataset : vin_bt | Freq. Percent Cum. ------------+----------------------------------- | 16 0.16 0.16 2D | 127 1.27 1.43 2H | 269 2.69 4.12 2L | 23 0.23 4.35 2P | 23 0.23 4.58 2T | 17 0.17 4.75 2W | 49 0.49 5.24 3C | 81 0.81 6.05 3D | 2 0.02 6.07 3P | 10 0.10 6.17 4B | 6 0.06 6.23 4C | 320 3.20 9.43 4D | 2,692 26.92 36.35 4H | 52 0.52 36.87 4L | 3 0.03 36.90 4P | 31 0.31 37.21 4T | 1 0.01 37.22 4W | 247 2.47 39.69 5D | 2 0.02 39.71 99 | 618 6.18 45.89 AC | 1 0.01 45.90 AT | 28 0.28 46.18 BU | 11 0.11 46.29 C4 | 6 0.06 46.35 CB | 65 0.65 47.00 CC | 50 0.50 47.50 CG | 45 0.45 47.95 CH | 5 0.05 48.00 CP | 587 5.87 53.87 CV | 106 1.06 54.93 CW | 250 2.50 57.43 DP | 4 0.04 57.47 DS | 469 4.69 62.16 EC | 22 0.22 62.38 EN | 6 0.06 62.44 ES | 13 0.13 62.57 FB | 3 0.03 62.60 FC | 5 0.05 62.65 HR | 3 0.03 62.68 HT | 1 0.01 62.69 IC | 44 0.44 63.13 IE | 13 0.13 63.26 LB | 4 0.04 63.30 MH | 4 0.04 63.34 MM | 1 0.01 63.35 MS | 4 0.04 63.39 MX | 9 0.09 63.48 MY | 11 0.11 63.59 P2 | 1 0.01 63.60 PC | 323 3.23 66.83 PK | 742 7.42 74.25 PS | 87 0.87 75.12 RD | 10 0.10 75.22 RS | 668 6.68 81.90 RT | 8 0.08 81.98 S1 | 1 0.01 81.99 S2 | 3 0.03 82.02 SC | 1 0.01 82.03 SN | 1 0.01 82.04 SV | 384 3.84 85.88 SW | 226 2.26 88.14 T | 3 0.03 88.17 TB | 32 0.32 88.49 TL | 20 0.20 88.69 TM | 68 0.68 89.37 UT | 1,026 10.26 99.63 VN | 18 0.18 99.81 YY | 19 0.19 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016