Frequencies for pbswalk variable in pbtype dataset :

   SideWalk |
   Presence |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,418       63.58       63.58
          1 |      1,241       23.08       86.66
          9 |        717       13.34      100.00
------------+-----------------------------------
      Total |      5,376      100.00

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