Frequencies for first 10,000 rows of clinic variable in nhamcsopd1993 dataset :

   hospital |
clinic code |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,680       26.80       26.80
          2 |      1,971       19.71       46.51
          3 |        900        9.00       55.51
          4 |        718        7.18       62.69
          5 |        952        9.52       72.21
          6 |        494        4.94       77.15
          7 |        149        1.49       78.64
         10 |        156        1.56       80.20
         12 |        242        2.42       82.62
         14 |        561        5.61       88.23
         17 |        122        1.22       89.45
         20 |        107        1.07       90.52
         21 |         18        0.18       90.70
         22 |        125        1.25       91.95
         23 |        301        3.01       94.96
         30 |        146        1.46       96.42
         34 |        217        2.17       98.59
         38 |        141        1.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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