Frequencies for first 10,000 rows of wic variable in linkpe2012usnum dataset :

     WIC R  |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,758       17.58       17.58
          N |      3,767       37.67       55.25
          U |        311        3.11       58.36
          Y |      4,164       41.64      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Jul 2017