Frequencies for first 10,000 rows of clinic variable in nhamcsopd1999 dataset :

   hospital |
clinic code |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      3,481       34.81       34.81
          2 |      2,005       20.05       54.86
          3 |      1,365       13.65       68.51
          4 |      1,319       13.19       81.70
          5 |      1,237       12.37       94.07
          6 |        286        2.86       96.93
          7 |        155        1.55       98.48
          8 |         58        0.58       99.06
          9 |         48        0.48       99.54
         10 |         42        0.42       99.96
         11 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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