Frequencies for first 10,000 rows of vin_bt variable in person dataset : vin_bt | Freq. Percent Cum. ------------+----------------------------------- | 903 9.03 9.03 2D | 231 2.31 11.34 2F | 3 0.03 11.37 2H | 522 5.22 16.59 2L | 30 0.30 16.89 2P | 16 0.16 17.05 2T | 47 0.47 17.52 2W | 58 0.58 18.10 3C | 21 0.21 18.31 3D | 11 0.11 18.42 4D | 2,345 23.45 41.87 4H | 77 0.77 42.64 4L | 3 0.03 42.67 4P | 48 0.48 43.15 4T | 8 0.08 43.23 4W | 124 1.24 44.47 8V | 2 0.02 44.49 99 | 501 5.01 49.50 AT | 12 0.12 49.62 BU | 2 0.02 49.64 CB | 58 0.58 50.22 CC | 60 0.60 50.82 CG | 16 0.16 50.98 CP | 837 8.37 59.35 CV | 67 0.67 60.02 CW | 19 0.19 60.21 CY | 1 0.01 60.22 DP | 2 0.02 60.24 DS | 291 2.91 63.15 EC | 8 0.08 63.23 ES | 19 0.19 63.42 EV | 7 0.07 63.49 FB | 4 0.04 63.53 FC | 2 0.02 63.55 GL | 4 0.04 63.59 HB | 2 0.02 63.61 IC | 93 0.93 64.54 IE | 25 0.25 64.79 LB | 6 0.06 64.85 LL | 7 0.07 64.92 MH | 5 0.05 64.97 MR | 1 0.01 64.98 MS | 2 0.02 65.00 MX | 3 0.03 65.03 MY | 13 0.13 65.16 NB | 1 0.01 65.17 PC | 316 3.16 68.33 PK | 1,303 13.03 81.36 PS | 114 1.14 82.50 RD | 4 0.04 82.54 RS | 189 1.89 84.43 RT | 3 0.03 84.46 S2 | 38 0.38 84.84 SD | 6 0.06 84.90 SV | 495 4.95 89.85 SW | 223 2.23 92.08 TB | 17 0.17 92.25 TL | 35 0.35 92.60 TM | 60 0.60 93.20 UT | 560 5.60 98.80 VD | 3 0.03 98.83 VN | 97 0.97 99.80 YY | 20 0.20 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016