Frequencies for first 10,000 rows of clinic variable in nhamcsopd1996 dataset :

   hospital |
clinic code |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,456       24.56       24.56
          2 |      1,463       14.63       39.19
          3 |      1,339       13.39       52.58
          4 |      1,292       12.92       65.50
          5 |      1,107       11.07       76.57
          6 |        379        3.79       80.36
          7 |        185        1.85       82.21
          8 |        154        1.54       83.75
          9 |         60        0.60       84.35
         10 |        221        2.21       86.56
         11 |        104        1.04       87.60
         12 |         61        0.61       88.21
         13 |         94        0.94       89.15
         14 |         31        0.31       89.46
         15 |         39        0.39       89.85
         16 |         40        0.40       90.25
         17 |         32        0.32       90.57
         18 |         68        0.68       91.25
         19 |         35        0.35       91.60
         21 |         43        0.43       92.03
         22 |         83        0.83       92.86
         24 |         75        0.75       93.61
         25 |         27        0.27       93.88
         27 |         35        0.35       94.23
         28 |         29        0.29       94.52
         31 |         30        0.30       94.82
         32 |         34        0.34       95.16
         33 |         22        0.22       95.38
         34 |         30        0.30       95.68
         36 |         32        0.32       96.00
         37 |         35        0.35       96.35
         41 |         17        0.17       96.52
         42 |         30        0.30       96.82
         43 |         62        0.62       97.44
         46 |         26        0.26       97.70
         48 |         31        0.31       98.01
         54 |         28        0.28       98.29
         55 |         63        0.63       98.92
         70 |         25        0.25       99.17
         71 |         33        0.33       99.50
         90 |         18        0.18       99.68
         91 |         32        0.32      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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