Frequencies for first 10,000 rows of clinic variable in nhamcsopd1997 dataset :

   hospital |
clinic code |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,410       24.10       24.10
          2 |      1,722       17.22       41.32
          3 |      1,556       15.56       56.88
          4 |      1,422       14.22       71.10
          5 |      1,212       12.12       83.22
          6 |        501        5.01       88.23
          7 |        291        2.91       91.14
          8 |        205        2.05       93.19
          9 |         90        0.90       94.09
         10 |         52        0.52       94.61
         11 |         76        0.76       95.37
         12 |        137        1.37       96.74
         14 |         27        0.27       97.01
         15 |         31        0.31       97.32
         16 |         25        0.25       97.57
         17 |         31        0.31       97.88
         19 |         54        0.54       98.42
         25 |         37        0.37       98.79
         41 |         23        0.23       99.02
         58 |         29        0.29       99.31
         66 |         30        0.30       99.61
         75 |          7        0.07       99.68
        108 |         32        0.32      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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