Frequencies for pvinmodyr variable in parkwork dataset :

  VIN Model |
       Year |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         65        6.49        6.49
          1 |         66        6.59       13.07
          2 |         49        4.89       17.96
          3 |         46        4.59       22.55
          4 |         62        6.19       28.74
          5 |         51        5.09       33.83
          6 |         53        5.29       39.12
          7 |         59        5.89       45.01
          8 |         58        5.79       50.80
          9 |         30        2.99       53.79
         10 |         35        3.49       57.29
         11 |         33        3.29       60.58
         12 |          4        0.40       60.98
         63 |          1        0.10       61.08
         67 |          1        0.10       61.18
         68 |          1        0.10       61.28
         69 |          2        0.20       61.48
         71 |          1        0.10       61.58
         72 |          1        0.10       61.68
         73 |          2        0.20       61.88
         76 |          2        0.20       62.08
         79 |          1        0.10       62.18
         80 |          2        0.20       62.38
         81 |          1        0.10       62.48
         82 |          1        0.10       62.57
         83 |          1        0.10       62.67
         84 |          4        0.40       63.07
         85 |          3        0.30       63.37
         86 |          1        0.10       63.47
         88 |         10        1.00       64.47
         89 |         10        1.00       65.47
         90 |         15        1.50       66.97
         91 |         11        1.10       68.06
         92 |         15        1.50       69.56
         93 |         27        2.69       72.26
         94 |         27        2.69       74.95
         95 |         32        3.19       78.14
         96 |         35        3.49       81.64
         97 |         38        3.79       85.43
         98 |         46        4.59       90.02
         99 |         47        4.69       94.71
          . |         53        5.29      100.00
------------+-----------------------------------
      Total |      1,002      100.00

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