Frequencies for first 10,000 rows of clinic variable in nhamcsed1993 dataset :

   hospital |
clinic code |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      8,973       89.73       89.73
          2 |        641        6.41       96.14
          3 |        107        1.07       97.21
          4 |        279        2.79      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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