Frequencies for first 10,000 rows of clinic variable in nhamcsed1992 dataset :

       Hosp |
  emergency |
    service |
area/clinic |
       code |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      8,597       85.97       85.97
          2 |        995        9.95       95.92
          3 |        262        2.62       98.54
          4 |        146        1.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016