Frequencies for first 10,000 rows of ser_tr variable in vehicle dataset : VIN Truck | series | Freq. Percent Cum. ------------+----------------------------------- | 7,134 71.34 71.34 30S | 6 0.06 71.40 350 | 2 0.02 71.42 4/5 | 2 0.02 71.44 40S | 20 0.20 71.64 44P | 3 0.03 71.67 450 | 1 0.01 71.68 590 | 1 0.01 71.69 600 | 23 0.23 71.92 700 | 10 0.10 72.02 70S | 6 0.06 72.08 720 | 2 0.02 72.10 80S | 6 0.06 72.16 90S | 6 0.06 72.22 910 | 3 0.03 72.25 920 | 8 0.08 72.33 940 | 13 0.13 72.46 990 | 4 0.04 72.50 ACA | 8 0.08 72.58 ARO | 11 0.11 72.69 AST | 25 0.25 72.94 AVL | 11 0.11 73.05 B23 | 10 0.10 73.15 B25 | 1 0.01 73.16 B30 | 5 0.05 73.21 BSR | 1 0.01 73.22 BUS | 2 0.02 73.24 C10 | 5 0.05 73.29 C15 | 8 0.08 73.37 C20 | 5 0.05 73.42 C55 | 5 0.05 73.47 C75 | 2 0.02 73.49 C85 | 1 0.01 73.50 C96 | 1 0.01 73.51 CAL | 16 0.16 73.67 CAN | 4 0.04 73.71 CCH | 2 0.02 73.73 CHA | 3 0.03 73.76 CHK | 46 0.46 74.22 CLT | 2 0.02 74.24 CMD | 7 0.07 74.31 CNV | 8 0.08 74.39 COE | 7 0.07 74.46 COF | 286 2.86 77.32 COL | 6 0.06 77.38 CON | 303 3.03 80.41 CSC | 12 0.12 80.53 CSR | 2 0.02 80.55 CTV | 16 0.16 80.71 CVS | 3 0.03 80.74 CWS | 1 0.01 80.75 D10 | 1 0.01 80.76 D15 | 1 0.01 80.77 D21 | 5 0.05 80.82 D30 | 2 0.02 80.84 D5I | 2 0.02 80.86 DAK | 54 0.54 81.40 DEN | 2 0.02 81.42 DIS | 5 0.05 81.47 DRW | 30 0.30 81.77 DUR | 1 0.01 81.78 E/D | 2 0.02 81.80 E/X | 2 0.02 81.82 ECO | 14 0.14 81.96 ENV | 16 0.16 82.12 ETV | 1 0.01 82.13 EXP | 15 0.15 82.28 FM2 | 7 0.07 82.35 FM6 | 1 0.01 82.36 FRE | 1 0.01 82.37 FRT | 35 0.35 82.72 GCK | 81 0.81 83.53 GM4 | 102 1.02 84.55 HIN | 6 0.06 84.61 HTL | 2 0.02 84.63 HTP | 14 0.14 84.77 HUM | 10 0.10 84.87 JEE | 2 0.02 84.89 JMY | 11 0.11 85.00 K10 | 3 0.03 85.03 K15 | 8 0.08 85.11 L/M | 1 0.01 85.12 LCF | 2 0.02 85.14 LIB | 18 0.18 85.32 LR3 | 4 0.04 85.36 MCV | 6 0.06 85.42 MHV | 7 0.07 85.49 MNT | 1 0.01 85.50 MON | 3 0.03 85.53 MRK | 2 0.02 85.55 NPR | 8 0.08 85.63 NQR | 1 0.01 85.64 P30 | 2 0.02 85.66 PCC | 1 0.01 85.67 PRO | 11 0.11 85.78 PRT | 2 0.02 85.80 PUP | 1 0.01 85.81 PYS | 1 0.01 85.82 R/V | 1 0.01 85.83 R10 | 1 0.01 85.84 R15 | 1 0.01 85.85 R35 | 1 0.01 85.86 RAI | 3 0.03 85.89 RID | 3 0.03 85.92 RMV | 9 0.09 86.01 RMW | 2 0.02 86.03 RNG | 134 1.34 87.37 RPC | 187 1.87 89.24 RRV | 3 0.03 89.27 RSP | 1 0.01 89.28 RX | 1 0.01 89.29 S | 81 0.81 90.10 S/V | 6 0.06 90.16 S10 | 2 0.02 90.18 S15 | 5 0.05 90.23 SAF | 9 0.09 90.32 SAV | 9 0.09 90.41 SIE | 107 1.07 91.48 SIL | 253 2.53 94.01 SON | 20 0.20 94.21 SPT | 1 0.01 94.22 SRW | 105 1.05 95.27 SS | 6 0.06 95.33 STE | 16 0.16 95.49 STV | 3 0.03 95.52 T10 | 3 0.03 95.55 TAC | 104 1.04 96.59 TER | 4 0.04 96.63 TNS | 1 0.01 96.64 TOP | 2 0.02 96.66 TRK | 20 0.20 96.86 TSR | 1 0.01 96.87 TTN | 22 0.22 97.09 TUN | 56 0.56 97.65 UDS | 1 0.01 97.66 UHT | 6 0.06 97.72 UPL | 3 0.03 97.75 V10 | 1 0.01 97.76 V15 | 2 0.02 97.78 V20 | 1 0.01 97.79 VAN | 42 0.42 98.21 VGN | 1 0.01 98.22 VTR | 9 0.09 98.31 VVN | 45 0.45 98.76 VWG | 1 0.01 98.77 W/T | 20 0.20 98.97 W/Y | 9 0.09 99.06 W10 | 1 0.01 99.07 W20 | 1 0.01 99.08 W30 | 1 0.01 99.09 WCN | 1 0.01 99.10 WHC | 1 0.01 99.11 WIN | 27 0.27 99.38 WRA | 13 0.13 99.51 WUL | 5 0.05 99.56 X44 | 1 0.01 99.57 XCB | 2 0.02 99.59 XPD | 5 0.05 99.64 Y/D | 1 0.01 99.65 YUK | 35 0.35 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016