Frequencies for first 10,000 rows of icu_srvc_cd variable in pos2010 dataset :

 SRV: ICU - |
MEDICAL/SUR |
      GICAL |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,626       86.26       86.26
          0 |        545        5.45       91.71
          1 |        780        7.80       99.51
          2 |         30        0.30       99.81
          3 |         19        0.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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