Frequencies for first 10,000 rows of prov2455 variable in pos1991 dataset :

       srv: |
respiratory |
       care |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,735       87.35       87.35
          0 |        257        2.57       89.92
          1 |        805        8.05       97.97
          2 |        182        1.82       99.79
          3 |         21        0.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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