Frequencies for first 10,000 rows of icu_srvc_cd variable in pos2012 dataset :

   Services |
  Provided: |
        ICU |
Medical/Sur |
      gical |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      8,606       86.06       86.06
          0 |        557        5.57       91.63
          1 |        775        7.75       99.38
          2 |         33        0.33       99.71
          3 |         29        0.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016