Frequencies for first 10,000 rows of ser_tr variable in vehicle dataset : VIN SERIES | TRUCK | Freq. Percent Cum. ------------+----------------------------------- | 4 0.04 0.04 *** | 6,400 64.00 64.04 20S | 1 0.01 64.05 3/4 | 1 0.01 64.06 30S | 2 0.02 64.08 4/5 | 1 0.01 64.09 400 | 1 0.01 64.10 40S | 33 0.33 64.43 44P | 6 0.06 64.49 550 | 1 0.01 64.50 560 | 2 0.02 64.52 590 | 1 0.01 64.53 600 | 34 0.34 64.87 620 | 1 0.01 64.88 700 | 8 0.08 64.96 70S | 1 0.01 64.97 720 | 5 0.05 65.02 80S | 7 0.07 65.09 90S | 12 0.12 65.21 910 | 4 0.04 65.25 920 | 14 0.14 65.39 940 | 12 0.12 65.51 990 | 1 0.01 65.52 999 | 497 4.97 70.49 ARO | 22 0.22 70.71 AST | 32 0.32 71.03 AVL | 10 0.10 71.13 B20 | 5 0.05 71.18 B22 | 5 0.05 71.23 B23 | 2 0.02 71.25 B25 | 2 0.02 71.27 B30 | 2 0.02 71.29 B40 | 1 0.01 71.30 C10 | 16 0.16 71.46 C15 | 11 0.11 71.57 C20 | 7 0.07 71.64 C25 | 2 0.02 71.66 C30 | 1 0.01 71.67 C35 | 1 0.01 71.68 C45 | 7 0.07 71.75 C55 | 1 0.01 71.76 C65 | 2 0.02 71.78 C75 | 1 0.01 71.79 C96 | 1 0.01 71.80 CAL | 15 0.15 71.95 CAN | 4 0.04 71.99 CAR | 2 0.02 72.01 CCH | 2 0.02 72.03 CHA | 8 0.08 72.11 CHK | 43 0.43 72.54 CMD | 3 0.03 72.57 CMP | 1 0.01 72.58 CNV | 5 0.05 72.63 COE | 20 0.20 72.83 COF | 311 3.11 75.94 COL | 3 0.03 75.97 COM | 5 0.05 76.02 CON | 418 4.18 80.20 CSC | 1 0.01 80.21 CSR | 4 0.04 80.25 CTV | 11 0.11 80.36 CVS | 3 0.03 80.39 CWS | 1 0.01 80.40 D10 | 1 0.01 80.41 D15 | 1 0.01 80.42 D20 | 4 0.04 80.46 D21 | 6 0.06 80.52 D51 | 1 0.01 80.53 DAK | 57 0.57 81.10 DEN | 4 0.04 81.14 DIS | 6 0.06 81.20 DRW | 32 0.32 81.52 E/X | 1 0.01 81.53 ECO | 9 0.09 81.62 ENV | 13 0.13 81.75 ETV | 5 0.05 81.80 EXP | 16 0.16 81.96 FCC | 2 0.02 81.98 FM2 | 9 0.09 82.07 FRT | 39 0.39 82.46 FTR | 1 0.01 82.47 GCK | 79 0.79 83.26 GM4 | 127 1.27 84.53 HFE | 1 0.01 84.54 HIN | 1 0.01 84.55 HOM | 1 0.01 84.56 HTP | 39 0.39 84.95 HUM | 6 0.06 85.01 J/E | 2 0.02 85.03 JMY | 21 0.21 85.24 K10 | 11 0.11 85.35 K15 | 6 0.06 85.41 K20 | 1 0.01 85.42 K25 | 2 0.02 85.44 KTA | 1 0.01 85.45 L10 | 1 0.01 85.46 LIB | 22 0.22 85.68 LR3 | 1 0.01 85.69 LUV | 1 0.01 85.70 M/T | 2 0.02 85.72 MCV | 10 0.10 85.82 MHV | 3 0.03 85.85 MMX | 3 0.03 85.88 MON | 2 0.02 85.90 MST | 1 0.01 85.91 NPR | 15 0.15 86.06 NQR | 1 0.01 86.07 NRR | 1 0.01 86.08 P30 | 8 0.08 86.16 P42 | 3 0.03 86.19 PYS | 1 0.01 86.20 R/V | 3 0.03 86.23 R10 | 2 0.02 86.25 R50 | 2 0.02 86.27 RAM | 2 0.02 86.29 RID | 1 0.01 86.30 RMV | 10 0.10 86.40 RMW | 1 0.01 86.41 RNG | 132 1.32 87.73 RPC | 168 1.68 89.41 RRV | 6 0.06 89.47 S | 94 0.94 90.41 S/V | 10 0.10 90.51 S10 | 8 0.08 90.59 S15 | 8 0.08 90.67 SAF | 10 0.10 90.77 SAV | 5 0.05 90.82 SCT | 1 0.01 90.83 SIE | 126 1.26 92.09 SIL | 210 2.10 94.19 SON | 21 0.21 94.40 SPR | 2 0.02 94.42 SRW | 96 0.96 95.38 SS | 5 0.05 95.43 STE | 20 0.20 95.63 STV | 2 0.02 95.65 T10 | 5 0.05 95.70 T7F | 1 0.01 95.71 TAC | 90 0.90 96.61 TER | 1 0.01 96.62 TRK | 28 0.28 96.90 TSP | 1 0.01 96.91 TSR | 2 0.02 96.93 TTN | 15 0.15 97.08 TUN | 58 0.58 97.66 UDS | 4 0.04 97.70 UHT | 4 0.04 97.74 UNI | 1 0.01 97.75 UPL | 1 0.01 97.76 V10 | 1 0.01 97.77 V15 | 1 0.01 97.78 VAN | 38 0.38 98.16 VHD | 1 0.01 98.17 VTR | 9 0.09 98.26 VVN | 45 0.45 98.71 VWG | 2 0.02 98.73 W/T | 12 0.12 98.85 W/Y | 11 0.11 98.96 W10 | 1 0.01 98.97 W15 | 1 0.01 98.98 W20 | 4 0.04 99.02 W30 | 1 0.01 99.03 WAG | 2 0.02 99.05 WCN | 5 0.05 99.10 WIN | 24 0.24 99.34 WRA | 6 0.06 99.40 X44 | 1 0.01 99.41 XCB | 3 0.03 99.44 XPD | 5 0.05 99.49 Y/D | 1 0.01 99.50 YUK | 50 0.50 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016