Frequencies for first 10,000 rows of clinic variable in nhamcsed1999 dataset :

   hospital |
clinic code |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      8,384       83.84       83.84
          2 |        865        8.65       92.49
          3 |        332        3.32       95.81
          4 |        256        2.56       98.37
          5 |        163        1.63      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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