Frequencies for pvin_1 variable in parkwork dataset :

        VIN |
Character(1 |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          2        0.19        0.19
          0 |          8        0.75        0.94
          1 |        577       54.23       55.17
          2 |        144       13.53       68.70
          3 |         39        3.67       72.37
          4 |         59        5.55       77.91
          5 |         35        3.29       81.20
          8 |          1        0.09       81.30
          9 |         34        3.20       84.49
          B |          1        0.09       84.59
          C |          3        0.28       84.87
          F |          2        0.19       85.06
          I |          1        0.09       85.15
          J |         86        8.08       93.23
          K |         19        1.79       95.02
          L |          1        0.09       95.11
          M |          1        0.09       95.21
          R |          1        0.09       95.30
          S |          7        0.66       95.96
          W |         37        3.48       99.44
          Y |          5        0.47       99.91
          Z |          1        0.09      100.00
------------+-----------------------------------
      Total |      1,064      100.00

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