Frequencies for first 10,000 rows of icu_srvc_cd variable in pos2013 dataset :

  Services: |
    Medical |
   Surgical |
   ICU Code |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      8,601       86.01       86.01
          0 |        558        5.58       91.59
          1 |        775        7.75       99.34
          2 |         32        0.32       99.66
          3 |         34        0.34      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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