Frequencies for first 10,000 rows of vin_bt variable in person dataset : vin_bt | Freq. Percent Cum. ------------+----------------------------------- | 847 8.47 8.47 2D | 328 3.28 11.75 2F | 11 0.11 11.86 2H | 565 5.65 17.51 2L | 51 0.51 18.02 2P | 4 0.04 18.06 2T | 271 2.71 20.77 2W | 2 0.02 20.79 3D | 29 0.29 21.08 4D | 2,030 20.30 41.38 4H | 177 1.77 43.15 4L | 7 0.07 43.22 4P | 16 0.16 43.38 4T | 26 0.26 43.64 4W | 12 0.12 43.76 99 | 566 5.66 49.42 AT | 21 0.21 49.63 BU | 34 0.34 49.97 CB | 49 0.49 50.46 CC | 35 0.35 50.81 CG | 14 0.14 50.95 CH | 4 0.04 50.99 CP | 1,063 10.63 61.62 CV | 69 0.69 62.31 CY | 23 0.23 62.54 DP | 1 0.01 62.55 DS | 185 1.85 64.40 EC | 4 0.04 64.44 EV | 5 0.05 64.49 FB | 6 0.06 64.55 FC | 9 0.09 64.64 GL | 4 0.04 64.68 HB | 8 0.08 64.76 HT | 1 0.01 64.77 IC | 54 0.54 65.31 IE | 1 0.01 65.32 LB | 14 0.14 65.46 MH | 6 0.06 65.52 MM | 3 0.03 65.55 MS | 5 0.05 65.60 MX | 2 0.02 65.62 MY | 11 0.11 65.73 NB | 13 0.13 65.86 PC | 112 1.12 66.98 PK | 1,652 16.52 83.50 PS | 80 0.80 84.30 RD | 4 0.04 84.34 RS | 238 2.38 86.72 RT | 8 0.08 86.80 S2 | 18 0.18 86.98 SD | 46 0.46 87.44 SN | 1 0.01 87.45 SV | 288 2.88 90.33 SW | 312 3.12 93.45 TB | 22 0.22 93.67 TL | 56 0.56 94.23 TM | 49 0.49 94.72 UT | 351 3.51 98.23 VN | 174 1.74 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