Frequencies for pvin_1 variable in parkwork dataset :

        vin |
character(1 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          2        0.18        0.18
          0 |          8        0.71        0.88
          1 |        570       50.31       51.19
          2 |        127       11.21       62.40
          3 |         94        8.30       70.70
          4 |         65        5.74       76.43
          5 |         59        5.21       81.64
          6 |          1        0.09       81.73
          8 |          5        0.44       82.17
          9 |         27        2.38       84.55
          F |          3        0.26       84.82
          J |         98        8.65       93.47
          K |         25        2.21       95.68
          N |          3        0.26       95.94
          S |          1        0.09       96.03
          T |          1        0.09       96.12
          W |         34        3.00       99.12
          Y |          9        0.79       99.91
          Z |          1        0.09      100.00
------------+-----------------------------------
      Total |      1,133      100.00

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