Frequencies for first 10,000 rows of icu_srvc_cd variable in pos2008 dataset :

 srv: icu - |
medical/sur |
      gical |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,655       86.55       86.55
          0 |        530        5.30       91.85
          1 |        774        7.74       99.59
          2 |         30        0.30       99.89
          3 |         11        0.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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