Frequencies for first 10,000 rows of prov2110 variable in pos2004 dataset :

       srv: |
   coronary |
  care unit |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,766       87.66       87.66
          0 |        677        6.77       94.43
          1 |        527        5.27       99.70
          2 |         27        0.27       99.97
          3 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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