Frequencies for pvin_1 variable in parkwork dataset :

        vin |
character(1 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          5        0.46        0.46
          1 |        560       51.66       52.12
          2 |        122       11.25       63.38
          3 |         76        7.01       70.39
          4 |         63        5.81       76.20
          5 |         47        4.34       80.54
          6 |          2        0.18       80.72
          9 |         27        2.49       83.21
          A |          1        0.09       83.30
          C |          2        0.18       83.49
          F |          1        0.09       83.58
          J |        112       10.33       93.91
          K |         26        2.40       96.31
          L |          1        0.09       96.40
          M |          1        0.09       96.49
          N |          1        0.09       96.59
          P |          1        0.09       96.68
          R |          1        0.09       96.77
          S |          5        0.46       97.23
          V |          2        0.18       97.42
          W |         24        2.21       99.63
          Y |          4        0.37      100.00
------------+-----------------------------------
      Total |      1,084      100.00

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