Frequencies for pvin_9 variable in parkwork dataset :

        vin |
character(9 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          3        0.28        0.28
          0 |        116       10.70       10.98
          1 |         93        8.58       19.56
          2 |         91        8.39       27.95
          3 |         83        7.66       35.61
          4 |         92        8.49       44.10
          5 |        110       10.15       54.24
          6 |        104        9.59       63.84
          7 |         88        8.12       71.96
          8 |         94        8.67       80.63
          9 |        126       11.62       92.25
          R |          1        0.09       92.34
          X |         83        7.66      100.00
------------+-----------------------------------
      Total |      1,084      100.00

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