Frequencies for pvin_7 variable in parkwork dataset :

        vin |
character(7 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          3        0.26        0.26
          0 |         42        3.71        3.97
          1 |         71        6.27       10.24
          2 |        135       11.92       22.15
          3 |         95        8.38       30.54
          4 |         81        7.15       37.69
          5 |         49        4.32       42.01
          6 |         89        7.86       49.87
          7 |         34        3.00       52.87
          8 |        102        9.00       61.87
          9 |         87        7.68       69.55
          A |         57        5.03       74.58
          B |         23        2.03       76.61
          C |         35        3.09       79.70
          D |         33        2.91       82.61
          E |         60        5.30       87.91
          F |         29        2.56       90.47
          G |         18        1.59       92.06
          H |         21        1.85       93.91
          J |         11        0.97       94.88
          K |          7        0.62       95.50
          L |          2        0.18       95.68
          M |         13        1.15       96.82
          N |          1        0.09       96.91
          P |          9        0.79       97.71
          R |          1        0.09       97.79
          S |          1        0.09       97.88
          T |          6        0.53       98.41
          U |          2        0.18       98.59
          V |          3        0.26       98.85
          W |          2        0.18       99.03
          X |          1        0.09       99.12
          Y |          8        0.71       99.82
          Z |          2        0.18      100.00
------------+-----------------------------------
      Total |      1,133      100.00

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