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

   Admit to |
  Intensive |
 Care Y Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      9,796       97.96       97.96
          U |        184        1.84       99.80
          Y |         20        0.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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