Frequencies for pvin_7 variable in parkwork dataset :

        vin |
character(7 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          3        0.26        0.26
          0 |         43        3.79        4.05
          1 |        106        9.33       13.38
          2 |        133       11.71       25.09
          3 |        104        9.15       34.24
          4 |        101        8.89       43.13
          5 |         55        4.84       47.98
          6 |         96        8.45       56.43
          7 |         37        3.26       59.68
          8 |        100        8.80       68.49
          9 |        103        9.07       77.55
          A |         44        3.87       81.43
          B |         22        1.94       83.36
          C |         34        2.99       86.36
          D |         25        2.20       88.56
          E |         38        3.35       91.90
          F |         15        1.32       93.22
          G |          9        0.79       94.01
          H |         23        2.02       96.04
          J |         16        1.41       97.45
          K |          4        0.35       97.80
          L |          1        0.09       97.89
          M |          1        0.09       97.98
          N |          3        0.26       98.24
          P |          4        0.35       98.59
          R |          1        0.09       98.68
          S |          3        0.26       98.94
          T |          4        0.35       99.30
          W |          1        0.09       99.38
          X |          2        0.18       99.56
          Y |          3        0.26       99.82
          Z |          2        0.18      100.00
------------+-----------------------------------
      Total |      1,136      100.00

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