Frequencies for first 10,000 rows of su variable in nhamcsopd1999 dataset :

   hospital |
   sampling |
  unit code |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,634       26.34       26.34
          2 |      1,402       14.02       40.36
          3 |        856        8.56       48.92
          4 |        729        7.29       56.21
          5 |        434        4.34       60.55
          6 |        383        3.83       64.38
          7 |        258        2.58       66.96
          8 |        289        2.89       69.85
          9 |        347        3.47       73.32
         10 |        360        3.60       76.92
         11 |        194        1.94       78.86
         12 |        266        2.66       81.52
         13 |        213        2.13       83.65
         14 |        124        1.24       84.89
         15 |         76        0.76       85.65
         16 |         90        0.90       86.55
         17 |         63        0.63       87.18
         18 |        145        1.45       88.63
         19 |         27        0.27       88.90
         22 |         23        0.23       89.13
         23 |        118        1.18       90.31
         24 |         56        0.56       90.87
         25 |         24        0.24       91.11
         26 |         25        0.25       91.36
         27 |         48        0.48       91.84
         29 |         52        0.52       92.36
         30 |         32        0.32       92.68
         34 |         58        0.58       93.26
         36 |         31        0.31       93.57
         44 |         42        0.42       93.99
         47 |         70        0.70       94.69
         50 |         36        0.36       95.05
         51 |         25        0.25       95.30
         52 |         29        0.29       95.59
         56 |         32        0.32       95.91
         57 |         19        0.19       96.10
         60 |         30        0.30       96.40
         61 |         17        0.17       96.57
         63 |         45        0.45       97.02
         64 |         28        0.28       97.30
         72 |         23        0.23       97.53
         82 |         10        0.10       97.63
         95 |         15        0.15       97.78
         97 |         36        0.36       98.14
        100 |         20        0.20       98.34
        102 |         38        0.38       98.72
        118 |         31        0.31       99.03
        121 |         54        0.54       99.57
        139 |         16        0.16       99.73
        165 |         27        0.27      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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