Frequencies for first 10,000 rows of su variable in nhamcsopd1992 dataset :

   Hospital |
   sampling |
  unit code |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,390       13.90       13.90
          2 |        797        7.97       21.87
          3 |        716        7.16       29.03
          4 |        735        7.35       36.38
          5 |        562        5.62       42.00
          6 |        421        4.21       46.21
          7 |        382        3.82       50.03
          8 |        533        5.33       55.36
          9 |        351        3.51       58.87
         10 |        557        5.57       64.44
         11 |        274        2.74       67.18
         12 |        283        2.83       70.01
         13 |        244        2.44       72.45
         14 |        158        1.58       74.03
         15 |        104        1.04       75.07
         16 |        229        2.29       77.36
         17 |         58        0.58       77.94
         18 |        154        1.54       79.48
         19 |        122        1.22       80.70
         20 |        146        1.46       82.16
         21 |         93        0.93       83.09
         22 |        126        1.26       84.35
         23 |         38        0.38       84.73
         24 |         63        0.63       85.36
         25 |         61        0.61       85.97
         26 |        160        1.60       87.57
         27 |         34        0.34       87.91
         28 |         75        0.75       88.66
         29 |        141        1.41       90.07
         31 |         58        0.58       90.65
         32 |         92        0.92       91.57
         34 |         90        0.90       92.47
         35 |         14        0.14       92.61
         36 |         58        0.58       93.19
         37 |         27        0.27       93.46
         39 |         28        0.28       93.74
         40 |         78        0.78       94.52
         42 |         41        0.41       94.93
         43 |         15        0.15       95.08
         44 |         16        0.16       95.24
         46 |         72        0.72       95.96
         47 |         50        0.50       96.46
         49 |         12        0.12       96.58
         58 |         23        0.23       96.81
         59 |         43        0.43       97.24
         61 |         59        0.59       97.83
         62 |         78        0.78       98.61
         63 |         29        0.29       98.90
         70 |         65        0.65       99.55
         98 |         31        0.31       99.86
        129 |         14        0.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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