Frequencies for first 10,000 rows of prov2455 variable in pos1997 dataset :

       srv: |
respiratory |
       care |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,725       87.25       87.25
          0 |        273        2.73       89.98
          1 |        813        8.13       98.11
          2 |        157        1.57       99.68
          3 |         32        0.32      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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