Frequencies for first 10,000 rows of su variable in nhamcsopd2000 dataset :

   hospital |
   sampling |
  unit code |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,146       21.46       21.46
          2 |      1,186       11.86       33.32
          3 |        679        6.79       40.11
          4 |        465        4.65       44.76
          5 |        389        3.89       48.65
          6 |        412        4.12       52.77
          7 |        282        2.82       55.59
          8 |        214        2.14       57.73
          9 |        312        3.12       60.85
         10 |        236        2.36       63.21
         11 |        269        2.69       65.90
         12 |        241        2.41       68.31
         13 |        364        3.64       71.95
         14 |        328        3.28       75.23
         15 |        120        1.20       76.43
         16 |        113        1.13       77.56
         17 |         67        0.67       78.23
         18 |         27        0.27       78.50
         19 |        140        1.40       79.90
         20 |         87        0.87       80.77
         21 |         96        0.96       81.73
         22 |        122        1.22       82.95
         23 |         56        0.56       83.51
         24 |         93        0.93       84.44
         25 |         97        0.97       85.41
         26 |        156        1.56       86.97
         27 |         34        0.34       87.31
         28 |         82        0.82       88.13
         29 |         80        0.80       88.93
         30 |         48        0.48       89.41
         32 |        133        1.33       90.74
         34 |         31        0.31       91.05
         35 |         72        0.72       91.77
         37 |         66        0.66       92.43
         39 |         56        0.56       92.99
         41 |         38        0.38       93.37
         42 |         17        0.17       93.54
         44 |         51        0.51       94.05
         45 |         95        0.95       95.00
         46 |         28        0.28       95.28
         48 |         15        0.15       95.43
         49 |          9        0.09       95.52
         51 |         20        0.20       95.72
         52 |         55        0.55       96.27
         53 |          1        0.01       96.28
         55 |         38        0.38       96.66
         57 |         21        0.21       96.87
         62 |         24        0.24       97.11
         65 |         10        0.10       97.21
         70 |         28        0.28       97.49
         71 |         32        0.32       97.81
         78 |         13        0.13       97.94
         81 |         50        0.50       98.44
         88 |         14        0.14       98.58
         90 |         22        0.22       98.80
         94 |         16        0.16       98.96
        107 |         24        0.24       99.20
        110 |         38        0.38       99.58
        127 |         25        0.25       99.83
        144 |         17        0.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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