Frequencies for first 10,000 rows of wic variable in natl2014 dataset :

  WIC Y Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      6,221       62.21       62.21
          U |        179        1.79       64.00
          Y |      3,600       36.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Jun 2016