Frequencies for pvinmodyr variable in parkwork dataset :

  vin model |
       year |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         73        6.69        6.69
          1 |         52        4.77       11.46
          2 |         59        5.41       16.87
          3 |         59        5.41       22.27
          4 |         63        5.77       28.05
          5 |         66        6.05       34.10
          6 |         75        6.87       40.97
          7 |         58        5.32       46.29
          8 |         58        5.32       51.60
          9 |         38        3.48       55.09
         10 |         39        3.57       58.66
         11 |         51        4.67       63.34
         12 |         41        3.76       67.09
         13 |          5        0.46       67.55
         60 |          1        0.09       67.64
         63 |          1        0.09       67.74
         66 |          1        0.09       67.83
         70 |          1        0.09       67.92
         71 |          1        0.09       68.01
         74 |          1        0.09       68.10
         78 |          1        0.09       68.19
         81 |          1        0.09       68.29
         82 |          1        0.09       68.38
         84 |          3        0.27       68.65
         85 |          3        0.27       68.93
         86 |          5        0.46       69.39
         87 |          4        0.37       69.75
         88 |          6        0.55       70.30
         89 |         11        1.01       71.31
         90 |          9        0.82       72.14
         91 |         10        0.92       73.05
         92 |         11        1.01       74.06
         93 |          6        0.55       74.61
         94 |         18        1.65       76.26
         95 |         29        2.66       78.92
         96 |         30        2.75       81.67
         97 |         54        4.95       86.62
         98 |         55        5.04       91.66
         99 |         53        4.86       96.52
          . |         38        3.48      100.00
------------+-----------------------------------
      Total |      1,091      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016