Frequencies for first 10,000 rows of vin_bt variable in vehicle dataset : vin_bt | Freq. Percent Cum. ------------+----------------------------------- | 5 0.05 0.05 2D | 72 0.72 0.77 2H | 213 2.13 2.90 2L | 20 0.20 3.10 2P | 16 0.16 3.26 2T | 4 0.04 3.30 2W | 49 0.49 3.79 3C | 58 0.58 4.37 3D | 1 0.01 4.38 3P | 11 0.11 4.49 4B | 2 0.02 4.51 4C | 325 3.25 7.76 4D | 2,680 26.80 34.56 4H | 89 0.89 35.45 4L | 1 0.01 35.46 4P | 11 0.11 35.57 4T | 1 0.01 35.58 4W | 288 2.88 38.46 5D | 7 0.07 38.53 99 | 512 5.12 43.65 AT | 54 0.54 44.19 BU | 18 0.18 44.37 C4 | 4 0.04 44.41 CB | 51 0.51 44.92 CC | 75 0.75 45.67 CG | 36 0.36 46.03 CH | 7 0.07 46.10 CP | 534 5.34 51.44 CV | 97 0.97 52.41 CW | 372 3.72 56.13 DS | 482 4.82 60.95 EC | 14 0.14 61.09 EN | 2 0.02 61.11 ES | 100 1.00 62.11 EV | 4 0.04 62.15 FB | 2 0.02 62.17 FC | 1 0.01 62.18 GG | 2 0.02 62.20 GL | 1 0.01 62.21 HR | 1 0.01 62.22 HT | 1 0.01 62.23 IC | 36 0.36 62.59 IE | 7 0.07 62.66 LB | 20 0.20 62.86 LL | 2 0.02 62.88 LM | 1 0.01 62.89 MH | 4 0.04 62.93 MM | 1 0.01 62.94 MP | 6 0.06 63.00 MS | 13 0.13 63.13 MX | 13 0.13 63.26 MY | 6 0.06 63.32 NB | 1 0.01 63.33 PC | 256 2.56 65.89 PK | 541 5.41 71.30 PS | 72 0.72 72.02 RC | 6 0.06 72.08 RD | 14 0.14 72.22 RS | 980 9.80 82.02 RT | 21 0.21 82.23 S1 | 3 0.03 82.26 S2 | 10 0.10 82.36 SV | 287 2.87 85.23 SW | 106 1.06 86.29 T | 6 0.06 86.35 TB | 25 0.25 86.60 TL | 13 0.13 86.73 TM | 69 0.69 87.42 UT | 1,229 12.29 99.71 VN | 10 0.10 99.81 YY | 19 0.19 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016