Frequencies for first 10,000 rows of prov2110 variable in pos2006 dataset :

 srv: icu - |
    cardiac |
(non-surgic |
        al) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,710       87.10       87.10
          0 |        724        7.24       94.34
          1 |        535        5.35       99.69
          2 |         26        0.26       99.95
          3 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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