Frequencies for first 10,000 rows of vin_bt variable in person dataset : vin_bt | Freq. Percent Cum. ------------+----------------------------------- | 896 8.96 8.96 2D | 364 3.64 12.60 2F | 10 0.10 12.70 2H | 601 6.01 18.71 2L | 55 0.55 19.26 2P | 9 0.09 19.35 2T | 307 3.07 22.42 2W | 6 0.06 22.48 3D | 58 0.58 23.06 4D | 1,826 18.26 41.32 4H | 174 1.74 43.06 4L | 14 0.14 43.20 4P | 27 0.27 43.47 4T | 33 0.33 43.80 4W | 12 0.12 43.92 99 | 505 5.05 48.97 AC | 1 0.01 48.98 AT | 5 0.05 49.03 BU | 17 0.17 49.20 CB | 73 0.73 49.93 CC | 54 0.54 50.47 CG | 23 0.23 50.70 CP | 1,021 10.21 60.91 CV | 85 0.85 61.76 CY | 9 0.09 61.85 DS | 168 1.68 63.53 EN | 1 0.01 63.54 ES | 5 0.05 63.59 EV | 1 0.01 63.60 EW | 3 0.03 63.63 FB | 5 0.05 63.68 FC | 3 0.03 63.71 GL | 6 0.06 63.77 HB | 10 0.10 63.87 HT | 3 0.03 63.90 IC | 50 0.50 64.40 IE | 5 0.05 64.45 LB | 16 0.16 64.61 LL | 3 0.03 64.64 MH | 8 0.08 64.72 MP | 1 0.01 64.73 MS | 8 0.08 64.81 MX | 1 0.01 64.82 MY | 26 0.26 65.08 NB | 10 0.10 65.18 PC | 65 0.65 65.83 PK | 1,702 17.02 82.85 PS | 38 0.38 83.23 RD | 4 0.04 83.27 RS | 287 2.87 86.14 RT | 2 0.02 86.16 S2 | 30 0.30 86.46 SD | 52 0.52 86.98 SN | 1 0.01 86.99 SV | 297 2.97 89.96 SW | 362 3.62 93.58 T | 1 0.01 93.59 TB | 22 0.22 93.81 TL | 46 0.46 94.27 TM | 65 0.65 94.92 UT | 350 3.50 98.42 VN | 151 1.51 99.93 WW | 2 0.02 99.95 XT | 5 0.05 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016