Frequencies for first 10,000 rows of mm_aicu variable in natl2017 dataset :

   Admit to |
  Intensive |
 Care Y Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      9,932       99.32       99.32
          U |         57        0.57       99.89
          Y |         11        0.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 19 Sep 2018