Frequencies for first 10,000 rows of wic variable in natl2016 dataset :

  WIC Y Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      6,396       63.96       63.96
          U |        169        1.69       65.65
          Y |      3,435       34.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 4 Oct 2017