Frequencies for pvin_1 variable in parkwork dataset :

        VIN |
Character(1 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          1        0.10        0.10
          0 |          7        0.70        0.80
          1 |        556       55.49       56.29
          2 |        117       11.68       67.96
          3 |         51        5.09       73.05
          4 |         43        4.29       77.35
          5 |         28        2.79       80.14
          7 |          1        0.10       80.24
          8 |          2        0.20       80.44
          9 |         47        4.69       85.13
          B |          2        0.20       85.33
          C |          8        0.80       86.13
          D |          1        0.10       86.23
          F |          1        0.10       86.33
          J |         84        8.38       94.71
          K |         20        2.00       96.71
          L |          1        0.10       96.81
          S |          4        0.40       97.21
          W |         19        1.90       99.10
          Y |          8        0.80       99.90
          Z |          1        0.10      100.00
------------+-----------------------------------
      Total |      1,002      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016