Frequencies for first 10,000 rows of vin_bt variable in person dataset : vin_bt | Freq. Percent Cum. ------------+----------------------------------- | 694 6.94 6.94 2D | 167 1.67 8.61 2H | 392 3.92 12.53 2L | 17 0.17 12.70 2P | 8 0.08 12.78 2T | 2 0.02 12.80 2W | 21 0.21 13.01 3C | 70 0.70 13.71 3D | 10 0.10 13.81 4C | 44 0.44 14.25 4D | 2,411 24.11 38.36 4H | 87 0.87 39.23 4L | 4 0.04 39.27 4P | 49 0.49 39.76 4W | 131 1.31 41.07 99 | 1,010 10.10 51.17 AT | 13 0.13 51.30 BU | 8 0.08 51.38 CB | 40 0.40 51.78 CC | 50 0.50 52.28 CG | 53 0.53 52.81 CP | 720 7.20 60.01 CV | 51 0.51 60.52 CW | 46 0.46 60.98 CY | 1 0.01 60.99 DP | 2 0.02 61.01 DS | 322 3.22 64.23 EC | 7 0.07 64.30 EN | 3 0.03 64.33 ES | 13 0.13 64.46 EV | 1 0.01 64.47 FB | 6 0.06 64.53 FC | 5 0.05 64.58 GL | 1 0.01 64.59 HT | 6 0.06 64.65 IC | 105 1.05 65.70 IE | 13 0.13 65.83 LB | 2 0.02 65.85 MH | 14 0.14 65.99 MS | 3 0.03 66.02 MX | 1 0.01 66.03 MY | 18 0.18 66.21 NB | 3 0.03 66.24 PC | 375 3.75 69.99 PK | 1,033 10.33 80.32 PS | 130 1.30 81.62 RD | 4 0.04 81.66 RS | 208 2.08 83.74 RT | 4 0.04 83.78 S2 | 30 0.30 84.08 SV | 618 6.18 90.26 SW | 206 2.06 92.32 T | 2 0.02 92.34 TB | 12 0.12 92.46 TL | 15 0.15 92.61 TM | 61 0.61 93.22 UT | 631 6.31 99.53 VN | 44 0.44 99.97 YY | 3 0.03 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016