Frequencies for first 10,000 rows of clinic variable in nhamcsopd1995 dataset :

   hospital |
clinic code |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,018       20.18       20.18
          2 |      1,637       16.37       36.55
          3 |      1,509       15.09       51.64
          4 |      1,469       14.69       66.33
          5 |      1,307       13.07       79.40
          6 |        447        4.47       83.87
          7 |        223        2.23       86.10
          8 |        149        1.49       87.59
          9 |        147        1.47       89.06
         10 |        188        1.88       90.94
         11 |        145        1.45       92.39
         12 |        133        1.33       93.72
         13 |         47        0.47       94.19
         15 |         52        0.52       94.71
         16 |         54        0.54       95.25
         17 |         32        0.32       95.57
         18 |         25        0.25       95.82
         19 |         32        0.32       96.14
         20 |         72        0.72       96.86
         22 |         17        0.17       97.03
         23 |         46        0.46       97.49
         24 |         35        0.35       97.84
         26 |         38        0.38       98.22
         27 |         47        0.47       98.69
         33 |         23        0.23       98.92
         34 |         20        0.20       99.12
         52 |         33        0.33       99.45
         69 |         23        0.23       99.68
         75 |         32        0.32      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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