Frequencies for first 10,000 rows of vin_bt variable in vehicle dataset : vin_bt | Freq. Percent Cum. ------------+----------------------------------- | 25 0.25 0.25 2D | 146 1.46 1.71 2H | 335 3.35 5.06 2L | 24 0.24 5.30 2P | 21 0.21 5.51 2T | 27 0.27 5.78 2W | 30 0.30 6.08 3C | 74 0.74 6.82 3D | 5 0.05 6.87 3P | 6 0.06 6.93 4B | 1 0.01 6.94 4C | 260 2.60 9.54 4D | 2,746 27.46 37.00 4H | 54 0.54 37.54 4L | 2 0.02 37.56 4P | 40 0.40 37.96 4T | 3 0.03 37.99 4W | 216 2.16 40.15 8V | 1 0.01 40.16 99 | 552 5.52 45.68 AT | 13 0.13 45.81 BU | 20 0.20 46.01 CB | 71 0.71 46.72 CC | 58 0.58 47.30 CG | 29 0.29 47.59 CM | 1 0.01 47.60 CP | 706 7.06 54.66 CV | 88 0.88 55.54 CW | 143 1.43 56.97 DP | 1 0.01 56.98 DS | 417 4.17 61.15 EC | 21 0.21 61.36 EN | 2 0.02 61.38 ES | 14 0.14 61.52 EV | 2 0.02 61.54 FB | 2 0.02 61.56 FC | 4 0.04 61.60 GL | 3 0.03 61.63 HT | 1 0.01 61.64 IC | 50 0.50 62.14 IE | 7 0.07 62.21 LB | 2 0.02 62.23 MH | 2 0.02 62.25 MP | 1 0.01 62.26 MS | 7 0.07 62.33 MX | 6 0.06 62.39 MY | 18 0.18 62.57 PC | 391 3.91 66.48 PK | 899 8.99 75.47 PS | 116 1.16 76.63 RD | 2 0.02 76.65 RS | 549 5.49 82.14 RT | 10 0.10 82.24 S2 | 2 0.02 82.26 SN | 3 0.03 82.29 SV | 418 4.18 86.47 SW | 264 2.64 89.11 TB | 34 0.34 89.45 TL | 22 0.22 89.67 TM | 109 1.09 90.76 UT | 876 8.76 99.52 VN | 29 0.29 99.81 VW | 2 0.02 99.83 WW | 1 0.01 99.84 YY | 16 0.16 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016