Frequencies for first 10,000 rows of clinic variable in nhamcsopd1998 dataset :

   hospital |
clinic code |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,995       29.95       29.95
          2 |      1,592       15.92       45.87
          3 |      1,411       14.11       59.98
          4 |      1,199       11.99       71.97
          5 |      1,128       11.28       83.25
          6 |        358        3.58       86.83
          7 |        141        1.41       88.24
          8 |        254        2.54       90.78
          9 |         78        0.78       91.56
         11 |         29        0.29       91.85
         13 |         48        0.48       92.33
         14 |         28        0.28       92.61
         15 |         63        0.63       93.24
         16 |         20        0.20       93.44
         17 |        100        1.00       94.44
         18 |         26        0.26       94.70
         19 |         59        0.59       95.29
         20 |         43        0.43       95.72
         21 |         41        0.41       96.13
         22 |         31        0.31       96.44
         23 |         20        0.20       96.64
         25 |         70        0.70       97.34
         29 |         30        0.30       97.64
         32 |         25        0.25       97.89
         33 |         10        0.10       97.99
         39 |         31        0.31       98.30
         41 |         26        0.26       98.56
         44 |         30        0.30       98.86
         52 |         14        0.14       99.00
         54 |         33        0.33       99.33
         67 |         32        0.32       99.65
         80 |         35        0.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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