Frequencies for first 10,000 rows of vin_bt variable in person dataset : vin_bt | Freq. Percent Cum. ------------+----------------------------------- | 669 6.69 6.69 2D | 81 0.81 7.50 2H | 243 2.43 9.93 2L | 13 0.13 10.06 2P | 17 0.17 10.23 2T | 5 0.05 10.28 2W | 29 0.29 10.57 3C | 71 0.71 11.28 3P | 14 0.14 11.42 4B | 6 0.06 11.48 4C | 323 3.23 14.71 4D | 2,444 24.44 39.15 4H | 64 0.64 39.79 4L | 3 0.03 39.82 4P | 39 0.39 40.21 4W | 275 2.75 42.96 5D | 3 0.03 42.99 99 | 402 4.02 47.01 AT | 37 0.37 47.38 BU | 17 0.17 47.55 C4 | 5 0.05 47.60 CB | 30 0.30 47.90 CC | 52 0.52 48.42 CG | 21 0.21 48.63 CH | 2 0.02 48.65 CP | 527 5.27 53.92 CV | 59 0.59 54.51 CW | 404 4.04 58.55 DP | 1 0.01 58.56 DS | 352 3.52 62.08 EC | 9 0.09 62.17 EN | 1 0.01 62.18 ES | 23 0.23 62.41 EV | 1 0.01 62.42 EW | 2 0.02 62.44 FB | 2 0.02 62.46 FC | 3 0.03 62.49 GL | 2 0.02 62.51 HT | 1 0.01 62.52 IC | 49 0.49 63.01 IE | 21 0.21 63.22 LB | 10 0.10 63.32 MH | 2 0.02 63.34 MS | 3 0.03 63.37 MX | 2 0.02 63.39 MY | 3 0.03 63.42 PC | 297 2.97 66.39 PK | 652 6.52 72.91 PS | 89 0.89 73.80 RD | 5 0.05 73.85 RS | 436 4.36 78.21 RT | 6 0.06 78.27 SN | 4 0.04 78.31 SV | 554 5.54 83.85 SW | 68 0.68 84.53 T | 1 0.01 84.54 TB | 21 0.21 84.75 TL | 12 0.12 84.87 TM | 47 0.47 85.34 UT | 1,421 14.21 99.55 VN | 17 0.17 99.72 YY | 28 0.28 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016