Frequencies for first 10,000 rows of icu_srvc_cd variable in pos1996 dataset :

       srv: |
  intensive |
  care unit |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,803       88.03       88.03
          0 |        399        3.99       92.02
          1 |        762        7.62       99.64
          2 |         30        0.30       99.94
          3 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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