Frequencies for first 10,000 rows of icu_srvc_cd variable in pos1994 dataset :

       srv: |
  intensive |
  care unit |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,940       89.40       89.40
          0 |        337        3.37       92.77
          1 |        699        6.99       99.76
          2 |         21        0.21       99.97
          3 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017