Frequencies for pvin_12 variable in parkwork dataset :

        vin |
character(1 |
         2) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          6        0.55        0.55
          0 |        154       14.14       14.69
          1 |        244       22.41       37.10
          2 |        140       12.86       49.95
          3 |         84        7.71       57.67
          4 |         39        3.58       61.25
          5 |         81        7.44       68.69
          6 |         52        4.78       73.46
          7 |         33        3.03       76.49
          8 |         28        2.57       79.06
          9 |         32        2.94       82.00
          A |         60        5.51       87.51
          B |         50        4.59       92.10
          C |         22        2.02       94.12
          D |          9        0.83       94.95
          E |          3        0.28       95.22
          F |          7        0.64       95.87
          H |          6        0.55       96.42
          J |          7        0.64       97.06
          K |          3        0.28       97.34
          M |          7        0.64       97.98
          N |          2        0.18       98.16
          P |          1        0.09       98.26
          S |          3        0.28       98.53
          T |          1        0.09       98.62
          U |          5        0.46       99.08
          V |          5        0.46       99.54
          W |          1        0.09       99.63
          Y |          2        0.18       99.82
          Z |          2        0.18      100.00
------------+-----------------------------------
      Total |      1,089      100.00

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