Frequencies for first 10,000 rows of vin_bt variable in vehicle dataset : vin_bt | Freq. Percent Cum. ------------+----------------------------------- | 2 0.02 0.02 2D | 214 2.14 2.16 2H | 476 4.76 6.92 2L | 40 0.40 7.32 2P | 13 0.13 7.45 2T | 3 0.03 7.48 2W | 32 0.32 7.80 3C | 56 0.56 8.36 3D | 10 0.10 8.46 3P | 1 0.01 8.47 4C | 62 0.62 9.09 4D | 2,522 25.22 34.31 4H | 90 0.90 35.21 4L | 4 0.04 35.25 4P | 33 0.33 35.58 4W | 136 1.36 36.94 99 | 1,275 12.75 49.69 AC | 1 0.01 49.70 AT | 12 0.12 49.82 BU | 11 0.11 49.93 CB | 58 0.58 50.51 CC | 76 0.76 51.27 CG | 51 0.51 51.78 CH | 1 0.01 51.79 CP | 722 7.22 59.01 CV | 82 0.82 59.83 CW | 40 0.40 60.23 CY | 1 0.01 60.24 DP | 3 0.03 60.27 DS | 434 4.34 64.61 EC | 15 0.15 64.76 EN | 3 0.03 64.79 ES | 7 0.07 64.86 EV | 3 0.03 64.89 FB | 5 0.05 64.94 FC | 3 0.03 64.97 GL | 2 0.02 64.99 HT | 2 0.02 65.01 IC | 68 0.68 65.69 IE | 9 0.09 65.78 LB | 2 0.02 65.80 MH | 8 0.08 65.88 MK | 1 0.01 65.89 MS | 4 0.04 65.93 MX | 4 0.04 65.97 MY | 16 0.16 66.13 NB | 2 0.02 66.15 PC | 349 3.49 69.64 PK | 1,028 10.28 79.92 PS | 136 1.36 81.28 RD | 5 0.05 81.33 RS | 384 3.84 85.17 RT | 6 0.06 85.23 S2 | 25 0.25 85.48 SV | 400 4.00 89.48 SW | 248 2.48 91.96 T | 2 0.02 91.98 TB | 24 0.24 92.22 TL | 31 0.31 92.53 TM | 78 0.78 93.31 UT | 619 6.19 99.50 VN | 41 0.41 99.91 YY | 9 0.09 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016