Frequencies for first 10,000 rows of vin_bt variable in person dataset : vin_bt | Freq. Percent Cum. ------------+----------------------------------- | 857 8.57 8.57 2D | 263 2.63 11.20 2H | 519 5.19 16.39 2L | 35 0.35 16.74 2P | 15 0.15 16.89 2T | 80 0.80 17.69 2W | 14 0.14 17.83 3D | 11 0.11 17.94 4D | 2,433 24.33 42.27 4H | 126 1.26 43.53 4L | 6 0.06 43.59 4P | 19 0.19 43.78 4T | 11 0.11 43.89 4W | 62 0.62 44.51 8V | 2 0.02 44.53 99 | 463 4.63 49.16 AT | 9 0.09 49.25 BU | 2 0.02 49.27 CB | 62 0.62 49.89 CC | 40 0.40 50.29 CG | 15 0.15 50.44 CL | 3 0.03 50.47 CP | 905 9.05 59.52 CV | 52 0.52 60.04 CW | 41 0.41 60.45 CY | 14 0.14 60.59 DP | 2 0.02 60.61 DS | 260 2.60 63.21 EC | 3 0.03 63.24 ES | 1 0.01 63.25 EV | 1 0.01 63.26 GL | 2 0.02 63.28 IC | 106 1.06 64.34 IE | 19 0.19 64.53 LB | 5 0.05 64.58 LL | 2 0.02 64.60 MH | 4 0.04 64.64 MX | 5 0.05 64.69 MY | 12 0.12 64.81 NB | 12 0.12 64.93 PC | 248 2.48 67.41 PK | 1,383 13.83 81.24 PS | 103 1.03 82.27 RD | 2 0.02 82.29 RS | 191 1.91 84.20 RT | 5 0.05 84.25 S2 | 25 0.25 84.50 SD | 6 0.06 84.56 SN | 1 0.01 84.57 SV | 514 5.14 89.71 SW | 279 2.79 92.50 T | 1 0.01 92.51 TB | 20 0.20 92.71 TL | 30 0.30 93.01 TM | 69 0.69 93.70 UT | 504 5.04 98.74 VN | 119 1.19 99.93 VW | 3 0.03 99.96 XT | 4 0.04 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016