Frequencies for first 10,000 rows of icu_srvc_cd variable in pos1992 dataset :

       srv: |
  intensive |
  care unit |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,851       88.51       88.51
          0 |        358        3.58       92.09
          1 |        759        7.59       99.68
          2 |         29        0.29       99.97
          3 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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