Frequencies for pvin_1 variable in parkwork dataset :

        vin |
character(1 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          5        0.46        0.46
          1 |        562       51.61       52.07
          2 |        122       11.20       63.27
          3 |         76        6.98       70.25
          4 |         64        5.88       76.12
          5 |         47        4.32       80.44
          6 |          2        0.18       80.62
          9 |         27        2.48       83.10
          A |          1        0.09       83.20
          C |          2        0.18       83.38
          F |          1        0.09       83.47
          J |        112       10.28       93.76
          K |         27        2.48       96.24
          L |          1        0.09       96.33
          M |          1        0.09       96.42
          N |          1        0.09       96.51
          P |          1        0.09       96.60
          R |          1        0.09       96.69
          S |          5        0.46       97.15
          V |          2        0.18       97.34
          W |         24        2.20       99.54
          Y |          5        0.46      100.00
------------+-----------------------------------
      Total |      1,089      100.00

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