Frequencies for pvin_9 variable in parkwork dataset :

        vin |
character(9 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          3        0.27        0.27
          0 |        104        9.53        9.81
          1 |         82        7.52       17.32
          2 |         88        8.07       25.39
          3 |        101        9.26       34.65
          4 |         92        8.43       43.08
          5 |        106        9.72       52.80
          6 |         85        7.79       60.59
          7 |        107        9.81       70.39
          8 |         86        7.88       78.28
          9 |        135       12.37       90.65
          L |          1        0.09       90.74
          X |        101        9.26      100.00
------------+-----------------------------------
      Total |      1,091      100.00

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