Frequencies for pvinmodyr variable in parkwork dataset :

  VIN Model |
       Year |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         71        6.67        6.67
          1 |         56        5.26       11.94
          2 |         58        5.45       17.39
          3 |         74        6.95       24.34
          4 |         51        4.79       29.14
          5 |         62        5.83       34.96
          6 |         58        5.45       40.41
          7 |         61        5.73       46.15
          8 |         51        4.79       50.94
          9 |         66        6.20       57.14
         10 |         35        3.29       60.43
         11 |          6        0.56       61.00
         82 |          3        0.28       61.28
         83 |          3        0.28       61.56
         84 |          3        0.28       61.84
         85 |          1        0.09       61.94
         86 |         11        1.03       62.97
         87 |         11        1.03       64.00
         88 |          7        0.66       64.66
         89 |         14        1.32       65.98
         90 |          8        0.75       66.73
         91 |         12        1.13       67.86
         92 |         16        1.50       69.36
         93 |         19        1.79       71.15
         94 |         37        3.48       74.62
         95 |         46        4.32       78.95
         96 |         40        3.76       82.71
         97 |         50        4.70       87.41
         98 |         47        4.42       91.82
         99 |         58        5.45       97.27
          . |         29        2.73      100.00
------------+-----------------------------------
      Total |      1,064      100.00

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