Frequencies for pvin_1 variable in parkwork dataset :

        vin |
character(1 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          3        0.27        0.27
          1 |        579       53.07       53.35
          2 |        119       10.91       64.25
          3 |         63        5.77       70.03
          4 |         61        5.59       75.62
          5 |         43        3.94       79.56
          6 |          1        0.09       79.65
          8 |          2        0.18       79.84
          9 |         39        3.57       83.41
          A |          2        0.18       83.59
          C |          1        0.09       83.68
          D |          1        0.09       83.78
          F |          1        0.09       83.87
          J |        113       10.36       94.23
          K |         31        2.84       97.07
          S |          3        0.27       97.34
          W |         28        2.57       99.91
          Y |          1        0.09      100.00
------------+-----------------------------------
      Total |      1,091      100.00

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