Frequencies for pvin_3 variable in parkwork dataset :

        vin |
character(3 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          6        0.55        0.55
          1 |         92        8.43        8.98
          2 |         28        2.57       11.55
          3 |         54        4.95       16.50
          4 |        118       10.82       27.31
          5 |          5        0.46       27.77
          6 |         26        2.38       30.16
          7 |         32        2.93       33.09
          8 |         35        3.21       36.30
          9 |         39        3.57       39.87
          A |         73        6.69       46.56
          B |         29        2.66       49.22
          C |         50        4.58       53.80
          D |         58        5.32       59.12
          E |         22        2.02       61.14
          F |          3        0.27       61.41
          G |         40        3.67       65.08
          H |         16        1.47       66.54
          J |          2        0.18       66.73
          K |         27        2.47       69.20
          L |         10        0.92       70.12
          M |         56        5.13       75.25
          N |         38        3.48       78.74
          P |         18        1.65       80.38
          R |          5        0.46       80.84
          S |         13        1.19       82.03
          T |        120       11.00       93.03
          U |         33        3.02       96.06
          V |         10        0.92       96.98
          W |         14        1.28       98.26
          X |         11        1.01       99.27
          Y |          3        0.27       99.54
          Z |          5        0.46      100.00
------------+-----------------------------------
      Total |      1,091      100.00

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