Frequencies for first 10,000 rows of vin_bt variable in vehicle dataset : vin_bt | Freq. Percent Cum. ------------+----------------------------------- | 89 0.89 0.89 2D | 353 3.53 4.42 2F | 3 0.03 4.45 2H | 620 6.20 10.65 2L | 77 0.77 11.42 2P | 5 0.05 11.47 2T | 216 2.16 13.63 2W | 5 0.05 13.68 3D | 37 0.37 14.05 4D | 2,073 20.73 34.78 4H | 173 1.73 36.51 4L | 9 0.09 36.60 4P | 19 0.19 36.79 4T | 30 0.30 37.09 4W | 20 0.20 37.29 99 | 868 8.68 45.97 AT | 10 0.10 46.07 BU | 11 0.11 46.18 CB | 80 0.80 46.98 CC | 62 0.62 47.60 CG | 24 0.24 47.84 CH | 1 0.01 47.85 CL | 1 0.01 47.86 CP | 1,021 10.21 58.07 CV | 77 0.77 58.84 CY | 5 0.05 58.89 DP | 1 0.01 58.90 DS | 321 3.21 62.11 EC | 3 0.03 62.14 ES | 5 0.05 62.19 EV | 1 0.01 62.20 EW | 1 0.01 62.21 FB | 6 0.06 62.27 FC | 7 0.07 62.34 GL | 2 0.02 62.36 HB | 10 0.10 62.46 HT | 1 0.01 62.47 IC | 38 0.38 62.85 IE | 3 0.03 62.88 LB | 12 0.12 63.00 LL | 4 0.04 63.04 MH | 4 0.04 63.08 MK | 2 0.02 63.10 MP | 1 0.01 63.11 MR | 1 0.01 63.12 MS | 10 0.10 63.22 MX | 2 0.02 63.24 MY | 10 0.10 63.34 NB | 11 0.11 63.45 PC | 138 1.38 64.83 PK | 1,580 15.80 80.63 PN | 1 0.01 80.64 PS | 74 0.74 81.38 RD | 6 0.06 81.44 RS | 452 4.52 85.96 RT | 11 0.11 86.07 S1 | 1 0.01 86.08 S2 | 25 0.25 86.33 SD | 29 0.29 86.62 SN | 9 0.09 86.71 SV | 236 2.36 89.07 SW | 306 3.06 92.13 T | 2 0.02 92.15 TB | 38 0.38 92.53 TL | 77 0.77 93.30 TM | 78 0.78 94.08 UT | 413 4.13 98.21 VN | 174 1.74 99.95 VW | 1 0.01 99.96 XT | 1 0.01 99.97 YY | 3 0.03 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016