Frequencies for first 10,000 rows of icu_srvc_cd variable in pos2015 dataset :

  Services: |
    Medical |
   Surgical |
   ICU Code |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      8,580       85.80       85.80
          0 |        577        5.77       91.57
          1 |        773        7.73       99.30
          2 |         32        0.32       99.62
          3 |         38        0.38      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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