Frequencies for first 10,000 rows of su variable in nhamcsopd1995 dataset :

   hospital |
   sampling |
  unit code |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,290       12.90       12.90
          2 |      1,149       11.49       24.39
          3 |        841        8.41       32.80
          4 |        967        9.67       42.47
          5 |      1,100       11.00       53.47
          6 |        356        3.56       57.03
          7 |        617        6.17       63.20
          8 |        258        2.58       65.78
          9 |        268        2.68       68.46
         10 |        314        3.14       71.60
         11 |        340        3.40       75.00
         12 |        242        2.42       77.42
         13 |        214        2.14       79.56
         14 |         49        0.49       80.05
         15 |        203        2.03       82.08
         16 |        173        1.73       83.81
         17 |        138        1.38       85.19
         18 |         52        0.52       85.71
         19 |        135        1.35       87.06
         20 |        104        1.04       88.10
         21 |         45        0.45       88.55
         22 |         33        0.33       88.88
         23 |         75        0.75       89.63
         25 |        110        1.10       90.73
         26 |         66        0.66       91.39
         27 |         18        0.18       91.57
         29 |         55        0.55       92.12
         30 |         26        0.26       92.38
         32 |         35        0.35       92.73
         33 |         49        0.49       93.22
         34 |         20        0.20       93.42
         35 |         32        0.32       93.74
         37 |         30        0.30       94.04
         38 |         31        0.31       94.35
         39 |         23        0.23       94.58
         40 |         13        0.13       94.71
         41 |         33        0.33       95.04
         44 |         18        0.18       95.22
         48 |         23        0.23       95.45
         49 |         47        0.47       95.92
         51 |         24        0.24       96.16
         54 |         52        0.52       96.68
         55 |         44        0.44       97.12
         59 |         41        0.41       97.53
         60 |         32        0.32       97.85
         64 |         16        0.16       98.01
         71 |         27        0.27       98.28
         84 |         18        0.18       98.46
         88 |         28        0.28       98.74
         99 |         44        0.44       99.18
        111 |         29        0.29       99.47
        115 |         30        0.30       99.77
        117 |         23        0.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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