Frequencies for first 10,000 rows of clinic variable in nhamcsopd1992 dataset :

   Hospital |
clinic code |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,152       21.52       21.52
          2 |      1,892       18.92       40.44
          3 |      1,887       18.87       59.31
          4 |      1,538       15.38       74.69
          5 |      1,452       14.52       89.21
          6 |        556        5.56       94.77
          7 |        268        2.68       97.45
          8 |        132        1.32       98.77
          9 |        123        1.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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