Frequencies for pvin_5 variable in parkwork dataset :

        vin |
character(5 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          8        0.73        0.73
          1 |          4        0.37        1.10
          2 |          6        0.55        1.65
          3 |          1        0.09        1.74
          4 |          8        0.73        2.48
          5 |          2        0.18        2.66
          6 |          2        0.18        2.85
          7 |          4        0.37        3.21
          9 |         28        2.57        5.79
          A |         78        7.16       12.95
          B |         38        3.49       16.44
          C |         91        8.36       24.79
          D |         58        5.33       30.12
          E |         43        3.95       34.07
          F |         88        8.08       42.15
          G |         40        3.67       45.82
          H |         19        1.74       47.57
          J |         31        2.85       50.41
          K |         76        6.98       57.39
          L |         37        3.40       60.79
          M |         38        3.49       64.28
          N |         32        2.94       67.22
          P |         96        8.82       76.03
          R |         43        3.95       79.98
          S |         44        4.04       84.02
          T |         37        3.40       87.42
          U |         41        3.76       91.18
          V |         13        1.19       92.38
          W |         31        2.85       95.22
          X |         31        2.85       98.07
          Y |         11        1.01       99.08
          Z |         10        0.92      100.00
------------+-----------------------------------
      Total |      1,089      100.00

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