Frequencies for first 10,000 rows of crnry_care_unit_srvc_cd variable in pos2005 dataset :

 srv: icu - |
    cardiac |
(non-surgic |
        al) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,731       87.31       87.31
          0 |        699        6.99       94.30
          1 |        537        5.37       99.67
          2 |         29        0.29       99.96
          3 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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