Frequencies for first 10,000 rows of vin_bt variable in person dataset : vin_bt | Freq. Percent Cum. ------------+----------------------------------- | 637 6.37 6.37 2D | 105 1.05 7.42 2H | 225 2.25 9.67 2L | 11 0.11 9.78 2P | 24 0.24 10.02 2T | 13 0.13 10.15 2W | 39 0.39 10.54 3C | 90 0.90 11.44 3D | 1 0.01 11.45 3P | 9 0.09 11.54 4B | 5 0.05 11.59 4C | 342 3.42 15.01 4D | 2,560 25.60 40.61 4H | 59 0.59 41.20 4L | 2 0.02 41.22 4P | 30 0.30 41.52 4W | 302 3.02 44.54 99 | 506 5.06 49.60 AC | 1 0.01 49.61 AT | 31 0.31 49.92 BU | 21 0.21 50.13 C4 | 9 0.09 50.22 CB | 47 0.47 50.69 CC | 40 0.40 51.09 CG | 30 0.30 51.39 CH | 8 0.08 51.47 CP | 531 5.31 56.78 CV | 82 0.82 57.60 CW | 245 2.45 60.05 DP | 4 0.04 60.09 DS | 349 3.49 63.58 EC | 16 0.16 63.74 EN | 1 0.01 63.75 ES | 14 0.14 63.89 FC | 3 0.03 63.92 HR | 6 0.06 63.98 IC | 67 0.67 64.65 IE | 11 0.11 64.76 LB | 3 0.03 64.79 MH | 3 0.03 64.82 MM | 1 0.01 64.83 MS | 2 0.02 64.85 MX | 2 0.02 64.87 MY | 9 0.09 64.96 PC | 300 3.00 67.96 PK | 731 7.31 75.27 PS | 75 0.75 76.02 RD | 4 0.04 76.06 RS | 360 3.60 79.66 RT | 3 0.03 79.69 S1 | 1 0.01 79.70 S2 | 2 0.02 79.72 SN | 1 0.01 79.73 SV | 542 5.42 85.15 SW | 215 2.15 87.30 T | 1 0.01 87.31 TB | 18 0.18 87.49 TL | 5 0.05 87.54 TM | 56 0.56 88.10 UT | 1,151 11.51 99.61 VN | 15 0.15 99.76 YY | 24 0.24 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016