Frequencies for pbcwalk variable in pbtype dataset :

     marked |
  crosswalk |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,620       82.48       82.48
          1 |      1,081       15.86       98.34
          9 |        113        1.66      100.00
------------+-----------------------------------
      Total |      6,814      100.00

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