Frequencies for first 10,000 rows of vin_bt variable in person dataset : vin_bt | Freq. Percent Cum. ------------+----------------------------------- | 928 9.28 9.28 2D | 291 2.91 12.19 2F | 3 0.03 12.22 2H | 551 5.51 17.73 2L | 67 0.67 18.40 2P | 1 0.01 18.41 2T | 169 1.69 20.10 2W | 11 0.11 20.21 3D | 31 0.31 20.52 4D | 2,094 20.94 41.46 4H | 146 1.46 42.92 4L | 6 0.06 42.98 4P | 31 0.31 43.29 4T | 22 0.22 43.51 4W | 28 0.28 43.79 99 | 766 7.66 51.45 AT | 11 0.11 51.56 BU | 25 0.25 51.81 CB | 54 0.54 52.35 CC | 45 0.45 52.80 CG | 22 0.22 53.02 CH | 2 0.02 53.04 CL | 1 0.01 53.05 CP | 957 9.57 62.62 CV | 49 0.49 63.11 CY | 11 0.11 63.22 DP | 1 0.01 63.23 DS | 225 2.25 65.48 EC | 1 0.01 65.49 ES | 6 0.06 65.55 EV | 1 0.01 65.56 EW | 2 0.02 65.58 FB | 4 0.04 65.62 FC | 8 0.08 65.70 GL | 3 0.03 65.73 HB | 10 0.10 65.83 HT | 3 0.03 65.86 IC | 76 0.76 66.62 IE | 10 0.10 66.72 LB | 3 0.03 66.75 LL | 3 0.03 66.78 MH | 4 0.04 66.82 MK | 2 0.02 66.84 MP | 4 0.04 66.88 MS | 7 0.07 66.95 MX | 1 0.01 66.96 MY | 9 0.09 67.05 NB | 10 0.10 67.15 PC | 122 1.22 68.37 PK | 1,483 14.83 83.20 PS | 71 0.71 83.91 RD | 3 0.03 83.94 RS | 206 2.06 86.00 RT | 5 0.05 86.05 S1 | 1 0.01 86.06 S2 | 26 0.26 86.32 SD | 23 0.23 86.55 SN | 3 0.03 86.58 SV | 278 2.78 89.36 SW | 308 3.08 92.44 T | 1 0.01 92.45 TB | 23 0.23 92.68 TL | 61 0.61 93.29 TM | 64 0.64 93.93 UT | 438 4.38 98.31 VN | 165 1.65 99.96 VW | 1 0.01 99.97 XT | 1 0.01 99.98 YY | 2 0.02 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016