Frequencies for pvin_8 variable in parkwork dataset :

        vin |
character(8 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          3        0.26        0.26
          0 |         19        1.68        1.94
          1 |         37        3.27        5.21
          2 |         25        2.21        7.41
          3 |         47        4.15       11.56
          4 |         38        3.35       14.92
          5 |         43        3.80       18.71
          6 |         19        1.68       20.39
          7 |         19        1.68       22.07
          8 |         25        2.21       24.27
          9 |         30        2.65       26.92
          A |         22        1.94       28.86
          B |         34        3.00       31.86
          C |         43        3.80       35.66
          D |         38        3.35       39.01
          E |         66        5.83       44.84
          F |         37        3.27       48.10
          G |         35        3.09       51.19
          H |         28        2.47       53.66
          J |         22        1.94       55.60
          K |         84        7.41       63.02
          L |         30        2.65       65.67
          M |         18        1.59       67.26
          N |         46        4.06       71.32
          P |         27        2.38       73.70
          R |         61        5.38       79.08
          S |         28        2.47       81.55
          T |         48        4.24       85.79
          U |         20        1.77       87.56
          V |         17        1.50       89.06
          W |         44        3.88       92.94
          X |         49        4.32       97.26
          Y |         20        1.77       99.03
          Z |         11        0.97      100.00
------------+-----------------------------------
      Total |      1,133      100.00

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