Frequencies for pser_tr variable in parkwork dataset : VIN Truck | series | Freq. Percent Cum. ------------+----------------------------------- | 597 59.58 59.58 40S | 25 2.50 62.08 600 | 6 0.60 62.67 700 | 1 0.10 62.77 70S | 3 0.30 63.07 90S | 2 0.20 63.27 920 | 1 0.10 63.37 940 | 1 0.10 63.47 ACA | 1 0.10 63.57 ARO | 1 0.10 63.67 AST | 2 0.20 63.87 AVL | 4 0.40 64.27 B22 | 1 0.10 64.37 B23 | 1 0.10 64.47 BUS | 1 0.10 64.57 C10 | 1 0.10 64.67 C45 | 1 0.10 64.77 C50 | 1 0.10 64.87 C85 | 2 0.20 65.07 CAL | 2 0.20 65.27 CAR | 10 1.00 66.27 CHA | 1 0.10 66.37 CHK | 1 0.10 66.47 CNV | 2 0.20 66.67 COE | 1 0.10 66.77 COF | 44 4.39 71.16 COH | 1 0.10 71.26 COL | 1 0.10 71.36 CON | 54 5.39 76.75 CSC | 4 0.40 77.15 CSR | 1 0.10 77.25 CTV | 3 0.30 77.54 DAK | 8 0.80 78.34 DEN | 1 0.10 78.44 DIS | 1 0.10 78.54 DRW | 11 1.10 79.64 ECO | 3 0.30 79.94 ETV | 1 0.10 80.04 EXP | 3 0.30 80.34 FE6 | 1 0.10 80.44 FLS | 1 0.10 80.54 FM2 | 3 0.30 80.84 FRT | 4 0.40 81.24 GCK | 12 1.20 82.44 GM4 | 19 1.90 84.33 HIN | 1 0.10 84.43 HTP | 2 0.20 84.63 HUM | 1 0.10 84.73 K10 | 1 0.10 84.83 LIB | 4 0.40 85.23 LR2 | 1 0.10 85.33 MCV | 1 0.10 85.43 MON | 1 0.10 85.53 NPR | 1 0.10 85.63 NQR | 1 0.10 85.73 P30 | 2 0.20 85.93 PRO | 6 0.60 86.53 RID | 1 0.10 86.63 RMV | 2 0.20 86.83 RNG | 10 1.00 87.82 RPC | 20 2.00 89.82 S | 6 0.60 90.42 S/P | 1 0.10 90.52 SAF | 1 0.10 90.62 SAV | 1 0.10 90.72 SED | 1 0.10 90.82 SIE | 12 1.20 92.02 SIL | 21 2.10 94.11 SON | 1 0.10 94.21 SRW | 7 0.70 94.91 STE | 3 0.30 95.21 T10 | 1 0.10 95.31 TAC | 6 0.60 95.91 TRK | 1 0.10 96.01 TTN | 4 0.40 96.41 TUN | 2 0.20 96.61 VAN | 8 0.80 97.41 VHD | 1 0.10 97.50 VOF | 2 0.20 97.70 VTR | 2 0.20 97.90 VVN | 5 0.50 98.40 W/T | 1 0.10 98.50 W/Y | 1 0.10 98.60 W20 | 1 0.10 98.70 WHC | 1 0.10 98.80 WIN | 3 0.30 99.10 WRA | 1 0.10 99.20 Y/D | 1 0.10 99.30 YUK | 7 0.70 100.00 ------------+----------------------------------- Total | 1,002 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016