Frequencies for first 10,000 rows of ser_tr variable in vehicle dataset : VIN | Series-Truc | k | Freq. Percent Cum. ------------+----------------------------------- | 28 0.28 0.28 *** | 4,378 43.78 44.06 620 | 14 0.14 44.20 999 | 4,453 44.53 88.73 A10 | 3 0.03 88.76 BRO | 4 0.04 88.80 C10 | 163 1.63 90.43 C20 | 75 0.75 91.18 C30 | 15 0.15 91.33 C40 | 1 0.01 91.34 C50 | 9 0.09 91.43 C60 | 9 0.09 91.52 C65 | 2 0.02 91.54 CHK | 2 0.02 91.56 CLU | 8 0.08 91.64 COF | 322 3.22 94.86 COL | 8 0.08 94.94 CON | 5 0.05 94.99 COU | 27 0.27 95.26 CPU | 2 0.02 95.28 D10 | 21 0.21 95.49 D20 | 13 0.13 95.62 D40 | 1 0.01 95.63 D60 | 2 0.02 95.65 ELC | 37 0.37 96.02 EPU | 1 0.01 96.03 G40 | 1 0.01 96.04 HLX | 15 0.15 96.19 HTP | 6 0.06 96.25 HTW | 10 0.10 96.35 JEE | 23 0.23 96.58 K10 | 36 0.36 96.94 K20 | 10 0.10 97.04 KOM | 4 0.04 97.08 KRV | 2 0.02 97.10 LCH | 3 0.03 97.13 LTC | 14 0.14 97.27 LUV | 23 0.23 97.50 M65 | 1 0.01 97.51 MHC | 1 0.01 97.52 MHV | 21 0.21 97.73 MXV | 7 0.07 97.80 MXW | 2 0.02 97.82 P30 | 3 0.03 97.85 P50 | 1 0.01 97.86 P52 | 4 0.04 97.90 P62 | 25 0.25 98.15 PAR | 1 0.01 98.16 PL5 | 10 0.10 98.26 RAM | 1 0.01 98.27 RAN | 20 0.20 98.47 RPU | 4 0.04 98.51 SPO | 7 0.07 98.58 SPT | 6 0.06 98.64 T60 | 1 0.01 98.65 TM7 | 1 0.01 98.66 TM8 | 1 0.01 98.67 TRA | 4 0.04 98.71 VAN | 106 1.06 99.77 VOY | 1 0.01 99.78 W10 | 12 0.12 99.90 W20 | 7 0.07 99.97 WAG | 3 0.03 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Apr 2016