Frequencies for first 10,000 rows of ser_tr variable in vehicle dataset : VIN SERIES | TRUCK | Freq. Percent Cum. ------------+----------------------------------- | 28 0.28 0.28 *** | 6,198 61.98 62.26 200 | 1 0.01 62.27 20S | 1 0.01 62.28 250 | 1 0.01 62.29 3/5 | 2 0.02 62.31 30S | 4 0.04 62.35 4/5 | 1 0.01 62.36 400 | 1 0.01 62.37 40S | 27 0.27 62.64 44P | 32 0.32 62.96 600 | 48 0.48 63.44 620 | 1 0.01 63.45 700 | 1 0.01 63.46 720 | 22 0.22 63.68 80S | 11 0.11 63.79 830 | 1 0.01 63.80 90S | 41 0.41 64.21 910 | 2 0.02 64.23 920 | 13 0.13 64.36 930 | 3 0.03 64.39 940 | 1 0.01 64.40 999 | 557 5.57 69.97 ACL | 1 0.01 69.98 ARO | 20 0.20 70.18 ART | 2 0.02 70.20 AST | 11 0.11 70.31 ATM | 1 0.01 70.32 B20 | 17 0.17 70.49 B22 | 13 0.13 70.62 B23 | 4 0.04 70.66 B25 | 4 0.04 70.70 B26 | 3 0.03 70.73 B30 | 1 0.01 70.74 B40 | 4 0.04 70.78 BRA | 1 0.01 70.79 BRO | 4 0.04 70.83 BSP | 3 0.03 70.86 BSR | 2 0.02 70.88 BUS | 1 0.01 70.89 BVN | 7 0.07 70.96 BZR | 3 0.03 70.99 C10 | 70 0.70 71.69 C15 | 20 0.20 71.89 C20 | 20 0.20 72.09 C25 | 7 0.07 72.16 C30 | 6 0.06 72.22 C35 | 2 0.02 72.24 C50 | 1 0.01 72.25 C60 | 1 0.01 72.26 C6M | 1 0.01 72.27 C6V | 1 0.01 72.28 C96 | 8 0.08 72.36 CAR | 4 0.04 72.40 CCH | 4 0.04 72.44 CGS | 2 0.02 72.46 CHK | 70 0.70 73.16 CLT | 1 0.01 73.17 CLU | 2 0.02 73.19 CMA | 1 0.01 73.20 CNV | 8 0.08 73.28 COE | 53 0.53 73.81 COF | 388 3.88 77.69 COH | 3 0.03 77.72 COL | 15 0.15 77.87 COM | 10 0.10 77.97 CON | 333 3.33 81.30 COU | 3 0.03 81.33 CSC | 2 0.02 81.35 CSR | 11 0.11 81.46 CTA | 1 0.01 81.47 CTS | 1 0.01 81.48 CTV | 32 0.32 81.80 CVS | 8 0.08 81.88 CWS | 1 0.01 81.89 D10 | 7 0.07 81.96 D15 | 3 0.03 81.99 D20 | 7 0.07 82.06 D21 | 23 0.23 82.29 D30 | 5 0.05 82.34 D5I | 4 0.04 82.38 DAK | 65 0.65 83.03 DEF | 1 0.01 83.04 DEN | 2 0.02 83.06 DIS | 2 0.02 83.08 DRW | 15 0.15 83.23 E/X | 1 0.01 83.24 ECO | 2 0.02 83.26 EPR | 1 0.01 83.27 ETV | 1 0.01 83.28 EXP | 4 0.04 83.32 FCC | 2 0.02 83.34 FFE | 1 0.01 83.35 FFV | 1 0.01 83.36 FH2 | 1 0.01 83.37 FM5 | 1 0.01 83.38 FM6 | 1 0.01 83.39 FRR | 2 0.02 83.41 FRT | 14 0.14 83.55 FTR | 1 0.01 83.56 G/P | 1 0.01 83.57 GCK | 56 0.56 84.13 GM4 | 234 2.34 86.47 H75 | 1 0.01 86.48 H95 | 1 0.01 86.49 HFE | 3 0.03 86.52 HLX | 2 0.02 86.54 HOM | 4 0.04 86.58 HTC | 1 0.01 86.59 HTL | 3 0.03 86.62 HTP | 95 0.95 87.57 HV7 | 1 0.01 87.58 INT | 1 0.01 87.59 J/E | 2 0.02 87.61 JEE | 15 0.15 87.76 JET | 2 0.02 87.78 JM8 | 1 0.01 87.79 JMY | 7 0.07 87.86 JOH | 1 0.01 87.87 K10 | 17 0.17 88.04 K15 | 14 0.14 88.18 K20 | 1 0.01 88.19 KOD | 5 0.05 88.24 KOM | 1 0.01 88.25 LB1 | 3 0.03 88.28 LCH | 3 0.03 88.31 LTC | 2 0.02 88.33 MAX | 1 0.01 88.34 MCV | 12 0.12 88.46 MET | 1 0.01 88.47 MHC | 2 0.02 88.49 MHV | 13 0.13 88.62 MMX | 11 0.11 88.73 MON | 3 0.03 88.76 MRM | 2 0.02 88.78 MXV | 1 0.01 88.79 NAV | 1 0.01 88.80 NPR | 6 0.06 88.86 P30 | 10 0.10 88.96 P42 | 1 0.01 88.97 PCC | 1 0.01 88.98 PUP | 4 0.04 89.02 PYS | 3 0.03 89.05 R/V | 9 0.09 89.14 R10 | 2 0.02 89.16 R15 | 1 0.01 89.17 R25 | 1 0.01 89.18 R30 | 2 0.02 89.20 R35 | 2 0.02 89.22 R50 | 9 0.09 89.31 RAI | 1 0.01 89.32 RAL | 1 0.01 89.33 RAM | 1 0.01 89.34 RMV | 25 0.25 89.59 RNG | 189 1.89 91.48 RPC | 123 1.23 92.71 RRV | 6 0.06 92.77 RUN | 1 0.01 92.78 S | 165 1.65 94.43 S/V | 17 0.17 94.60 S10 | 4 0.04 94.64 S15 | 14 0.14 94.78 SAF | 15 0.15 94.93 SAV | 1 0.01 94.94 SBS | 1 0.01 94.95 SCT | 2 0.02 94.97 SIE | 71 0.71 95.68 SIL | 40 0.40 96.08 SON | 20 0.20 96.28 SPO | 2 0.02 96.30 SPR | 1 0.01 96.31 SPT | 1 0.01 96.32 SRW | 30 0.30 96.62 SS | 17 0.17 96.79 STE | 8 0.08 96.87 STV | 1 0.01 96.88 T10 | 9 0.09 96.97 TAC | 43 0.43 97.40 TNS | 1 0.01 97.41 TOP | 7 0.07 97.48 TRK | 40 0.40 97.88 TRO | 1 0.01 97.89 TUN | 7 0.07 97.96 UDS | 2 0.02 97.98 UHT | 1 0.01 97.99 V15 | 6 0.06 98.05 V25 | 1 0.01 98.06 V30 | 2 0.02 98.08 V35 | 2 0.02 98.10 VAN | 86 0.86 98.96 VVN | 21 0.21 99.17 VWG | 1 0.01 99.18 VYG | 1 0.01 99.19 W/T | 12 0.12 99.31 W/Y | 27 0.27 99.58 W10 | 2 0.02 99.60 W20 | 2 0.02 99.62 W30 | 1 0.01 99.63 WAG | 4 0.04 99.67 WCN | 5 0.05 99.72 WHC | 2 0.02 99.74 WLC | 1 0.01 99.75 WRA | 2 0.02 99.77 X44 | 7 0.07 99.84 XCB | 2 0.02 99.86 XCN | 1 0.01 99.87 XPD | 4 0.04 99.91 YUK | 9 0.09 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016