Frequencies for pbcwalk variable in pbtype dataset :

     Marked |
  CrossWalk |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,221       78.52       78.52
          1 |        807       15.01       93.53
          9 |        348        6.47      100.00
------------+-----------------------------------
      Total |      5,376      100.00

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