Frequencies for pser_tr variable in parkwork dataset : VIN Truck | series | Freq. Percent Cum. ------------+----------------------------------- | 642 60.34 60.34 20S | 2 0.19 60.53 40S | 14 1.32 61.84 550 | 1 0.09 61.94 600 | 10 0.94 62.88 700 | 1 0.09 62.97 70S | 2 0.19 63.16 80S | 1 0.09 63.25 90S | 3 0.28 63.53 920 | 4 0.38 63.91 940 | 3 0.28 64.19 ACA | 1 0.09 64.29 AST | 6 0.56 64.85 AVL | 2 0.19 65.04 B30 | 1 0.09 65.13 B40 | 1 0.09 65.23 C10 | 1 0.09 65.32 C20 | 2 0.19 65.51 C25 | 1 0.09 65.60 C55 | 3 0.28 65.88 C75 | 1 0.09 65.98 CAL | 2 0.19 66.17 CAN | 2 0.19 66.35 CDC | 1 0.09 66.45 CHK | 7 0.66 67.11 CNV | 1 0.09 67.20 COE | 1 0.09 67.29 COF | 48 4.51 71.80 COL | 2 0.19 71.99 CON | 56 5.26 77.26 CSC | 3 0.28 77.54 CSR | 1 0.09 77.63 CTV | 4 0.38 78.01 CVS | 2 0.19 78.20 D10 | 1 0.09 78.29 D21 | 1 0.09 78.38 D30 | 2 0.19 78.57 DAK | 8 0.75 79.32 DRW | 15 1.41 80.73 ECO | 1 0.09 80.83 ENV | 1 0.09 80.92 EXP | 3 0.28 81.20 FRT | 2 0.19 81.39 FTR | 1 0.09 81.48 GCK | 12 1.13 82.61 GM4 | 9 0.85 83.46 HIN | 2 0.19 83.65 HTP | 5 0.47 84.12 K10 | 1 0.09 84.21 K15 | 1 0.09 84.30 LCF | 1 0.09 84.40 LIB | 6 0.56 84.96 MHV | 2 0.19 85.15 MON | 1 0.09 85.24 NPR | 1 0.09 85.34 PRO | 2 0.19 85.53 PRT | 1 0.09 85.62 RAI | 1 0.09 85.71 RID | 1 0.09 85.81 RMV | 3 0.28 86.09 RNG | 14 1.32 87.41 RPC | 16 1.50 88.91 RSP | 1 0.09 89.00 S | 10 0.94 89.94 S/V | 1 0.09 90.04 SAV | 2 0.19 90.23 SIE | 8 0.75 90.98 SIL | 26 2.44 93.42 SON | 3 0.28 93.70 SRW | 8 0.75 94.45 SS | 2 0.19 94.64 STE | 4 0.38 95.02 STV | 1 0.09 95.11 T7F | 1 0.09 95.21 TAC | 8 0.75 95.96 TRK | 2 0.19 96.15 TTN | 1 0.09 96.24 TUN | 6 0.56 96.80 VAN | 8 0.75 97.56 VTR | 2 0.19 97.74 VVN | 4 0.38 98.12 W/T | 2 0.19 98.31 WHC | 1 0.09 98.40 WIN | 10 0.94 99.34 YUK | 7 0.66 100.00 ------------+----------------------------------- Total | 1,064 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016