Frequencies for pmodel variable in parkwork dataset :

    Vehicle |
      Model |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          9        0.85        0.85
          2 |         20        1.88        2.73
          3 |         21        1.97        4.70
          4 |          5        0.47        5.17
          5 |          2        0.19        5.36
          6 |          4        0.38        5.73
          7 |          6        0.56        6.30
          8 |          1        0.09        6.39
          9 |          4        0.38        6.77
         10 |          2        0.19        6.95
         13 |          2        0.19        7.14
         16 |         26        2.44        9.59
         17 |         11        1.03       10.62
         18 |         12        1.13       11.75
         20 |         15        1.41       13.16
         21 |          5        0.47       13.63
         22 |          7        0.66       14.29
         23 |          3        0.28       14.57
         24 |          6        0.56       15.13
         26 |          1        0.09       15.23
         31 |         24        2.26       17.48
         32 |         51        4.79       22.27
         33 |          7        0.66       22.93
         34 |         19        1.79       24.72
         35 |         14        1.32       26.03
         36 |          6        0.56       26.60
         37 |         31        2.91       29.51
         38 |          4        0.38       29.89
         39 |          4        0.38       30.26
         40 |         26        2.44       32.71
         41 |          4        0.38       33.08
         42 |          9        0.85       33.93
         43 |         23        2.16       36.09
         44 |          1        0.09       36.18
         45 |          1        0.09       36.28
         46 |          8        0.75       37.03
         47 |         20        1.88       38.91
         48 |          3        0.28       39.19
         49 |          1        0.09       39.29
         50 |          1        0.09       39.38
         51 |          6        0.56       39.94
         52 |          2        0.19       40.13
         54 |          2        0.19       40.32
        398 |          4        0.38       40.70
        399 |          6        0.56       41.26
        401 |         56        5.26       46.52
        402 |         21        1.97       48.50
        403 |          9        0.85       49.34
        404 |         26        2.44       51.79
        405 |          5        0.47       52.26
        407 |          1        0.09       52.35
        421 |         17        1.60       53.95
        422 |         11        1.03       54.98
        431 |          7        0.66       55.64
        441 |         26        2.44       58.08
        442 |         28        2.63       60.71
        443 |          8        0.75       61.47
        461 |         23        2.16       63.63
        471 |         37        3.48       67.11
        472 |         22        2.07       69.17
        473 |          3        0.28       69.45
        481 |        112       10.53       79.98
        482 |         24        2.26       82.24
        499 |          1        0.09       82.33
        705 |          1        0.09       82.42
        706 |          8        0.75       83.18
        804 |          1        0.09       83.27
        806 |          2        0.19       83.46
        809 |          4        0.38       83.83
        850 |          2        0.19       84.02
        880 |          3        0.28       84.30
        881 |        112       10.53       94.83
        882 |          5        0.47       95.30
        883 |         18        1.69       96.99
        884 |          4        0.38       97.37
        898 |          1        0.09       97.46
        899 |          2        0.19       97.65
        981 |          1        0.09       97.74
        998 |         13        1.22       98.97
        999 |         11        1.03      100.00
------------+-----------------------------------
      Total |      1,064      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016