Frequencies for pveh_sc1 variable in parkwork dataset :

    Related |
factors (1) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        991       98.90       98.90
         33 |          1        0.10       99.00
         36 |          1        0.10       99.10
         39 |          1        0.10       99.20
         40 |          1        0.10       99.30
         41 |          3        0.30       99.60
         42 |          4        0.40      100.00
------------+-----------------------------------
      Total |      1,002      100.00

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