Frequencies for first 10,000 rows of mm_aicu variable in natlterr2014 dataset :

   Admit to |
  Intensive |
 Care Y Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,077       10.77       10.77
          N |      8,701       87.01       97.78
          U |        216        2.16       99.94
          Y |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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