Frequencies for first 10,000 rows of vin_bt variable in vehicle dataset : vin_bt | Freq. Percent Cum. ------------+----------------------------------- | 119 1.19 1.19 2D | 431 4.31 5.50 2F | 8 0.08 5.58 2H | 660 6.60 12.18 2L | 77 0.77 12.95 2P | 6 0.06 13.01 2T | 332 3.32 16.33 2W | 3 0.03 16.36 3D | 49 0.49 16.85 4D | 1,763 17.63 34.48 4H | 185 1.85 36.33 4L | 10 0.10 36.43 4P | 22 0.22 36.65 4T | 31 0.31 36.96 4W | 11 0.11 37.07 99 | 789 7.89 44.96 AC | 1 0.01 44.97 AT | 11 0.11 45.08 BU | 7 0.07 45.15 CB | 105 1.05 46.20 CC | 66 0.66 46.86 CG | 13 0.13 46.99 CH | 1 0.01 47.00 CP | 1,027 10.27 57.27 CV | 111 1.11 58.38 CY | 6 0.06 58.44 DS | 229 2.29 60.73 EN | 1 0.01 60.74 ES | 1 0.01 60.75 EV | 2 0.02 60.77 EW | 1 0.01 60.78 FB | 11 0.11 60.89 FC | 3 0.03 60.92 GL | 7 0.07 60.99 HB | 16 0.16 61.15 HT | 4 0.04 61.19 IC | 34 0.34 61.53 IE | 1 0.01 61.54 LB | 21 0.21 61.75 LL | 4 0.04 61.79 LM | 1 0.01 61.80 MH | 8 0.08 61.88 MP | 1 0.01 61.89 MS | 16 0.16 62.05 MX | 2 0.02 62.07 MY | 15 0.15 62.22 NB | 10 0.10 62.32 PC | 79 0.79 63.11 PK | 1,718 17.18 80.29 PS | 54 0.54 80.83 RD | 4 0.04 80.87 RS | 561 5.61 86.48 RT | 12 0.12 86.60 S2 | 23 0.23 86.83 SD | 64 0.64 87.47 SN | 5 0.05 87.52 SV | 204 2.04 89.56 SW | 347 3.47 93.03 T | 4 0.04 93.07 TB | 28 0.28 93.35 TL | 73 0.73 94.08 TM | 77 0.77 94.85 UT | 350 3.50 98.35 VN | 160 1.60 99.95 WW | 1 0.01 99.96 XT | 4 0.04 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016