Frequencies for first 10,000 rows of mm_icu variable in natlterr2012 dataset :

   Admit to |
  Intensive |
       Care |
626=f_mm_ic |
        u R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,163       11.63       11.63
          N |      8,457       84.57       96.20
          U |        374        3.74       99.94
          Y |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 5 May 2016