Frequencies for first 10,000 rows of vin_bt variable in vehicle dataset : vin_bt | Freq. Percent Cum. ------------+----------------------------------- | 38 0.38 0.38 2D | 211 2.11 2.49 2F | 1 0.01 2.50 2H | 452 4.52 7.02 2L | 40 0.40 7.42 2P | 21 0.21 7.63 2T | 25 0.25 7.88 2W | 32 0.32 8.20 3C | 80 0.80 9.00 3D | 3 0.03 9.03 3P | 3 0.03 9.06 4C | 162 1.62 10.68 4D | 2,597 25.97 36.65 4H | 56 0.56 37.21 4L | 5 0.05 37.26 4P | 40 0.40 37.66 4T | 5 0.05 37.71 4W | 174 1.74 39.45 99 | 579 5.79 45.24 AC | 1 0.01 45.25 AT | 20 0.20 45.45 BU | 20 0.20 45.65 CB | 71 0.71 46.36 CC | 73 0.73 47.09 CG | 41 0.41 47.50 CP | 737 7.37 54.87 CV | 114 1.14 56.01 CW | 66 0.66 56.67 DP | 3 0.03 56.70 DS | 426 4.26 60.96 EC | 19 0.19 61.15 EN | 2 0.02 61.17 ES | 13 0.13 61.30 FB | 1 0.01 61.31 FC | 6 0.06 61.37 GL | 5 0.05 61.42 HT | 1 0.01 61.43 IC | 56 0.56 61.99 IE | 6 0.06 62.05 LB | 1 0.01 62.06 LL | 1 0.01 62.07 LM | 2 0.02 62.09 MH | 5 0.05 62.14 MM | 1 0.01 62.15 MS | 1 0.01 62.16 MX | 6 0.06 62.22 MY | 10 0.10 62.32 NB | 1 0.01 62.33 PC | 407 4.07 66.40 PK | 1,041 10.41 76.81 PS | 148 1.48 78.29 RD | 8 0.08 78.37 RS | 468 4.68 83.05 RT | 7 0.07 83.12 S2 | 9 0.09 83.21 SD | 5 0.05 83.26 SV | 404 4.04 87.30 SW | 238 2.38 89.68 T | 2 0.02 89.70 TB | 42 0.42 90.12 TL | 24 0.24 90.36 TM | 121 1.21 91.57 UT | 784 7.84 99.41 VN | 48 0.48 99.89 YY | 11 0.11 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016