Frequencies for pvin_6 variable in parkwork dataset :

        vin |
character(6 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         41        3.58        3.58
          1 |        224       19.55       23.12
          2 |        112        9.77       32.90
          3 |        116       10.12       43.02
          4 |         94        8.20       51.22
          5 |        179       15.62       66.84
          6 |         61        5.32       72.16
          7 |         53        4.62       76.79
          8 |         46        4.01       80.80
          9 |         86        7.50       88.31
          A |         23        2.01       90.31
          B |         26        2.27       92.58
          C |         11        0.96       93.54
          D |          6        0.52       94.07
          E |          1        0.09       94.15
          F |          6        0.52       94.68
          G |          3        0.26       94.94
          H |          3        0.26       95.20
          J |          4        0.35       95.55
          K |          1        0.09       95.64
          L |          8        0.70       96.34
          M |          3        0.26       96.60
          P |          3        0.26       96.86
          R |          2        0.17       97.03
          S |         13        1.13       98.17
          T |          3        0.26       98.43
          U |          2        0.17       98.60
          V |          2        0.17       98.78
          W |          3        0.26       99.04
          X |          2        0.17       99.21
          Y |          2        0.17       99.39
          Z |          7        0.61      100.00
------------+-----------------------------------
      Total |      1,146      100.00

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