Frequencies for first 10,000 rows of su variable in nhamcsopd1998 dataset :

   hospital |
   sampling |
  unit code |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,947       19.47       19.47
          2 |        847        8.47       27.94
          3 |        653        6.53       34.47
          4 |        584        5.84       40.31
          5 |        423        4.23       44.54
          6 |        417        4.17       48.71
          7 |        344        3.44       52.15
          8 |        532        5.32       57.47
          9 |        359        3.59       61.06
         10 |        298        2.98       64.04
         11 |        283        2.83       66.87
         12 |        357        3.57       70.44
         13 |         87        0.87       71.31
         14 |        189        1.89       73.20
         15 |        278        2.78       75.98
         16 |        188        1.88       77.86
         17 |        158        1.58       79.44
         18 |         83        0.83       80.27
         19 |        155        1.55       81.82
         20 |        142        1.42       83.24
         21 |         21        0.21       83.45
         22 |        139        1.39       84.84
         23 |         45        0.45       85.29
         24 |         90        0.90       86.19
         25 |         50        0.50       86.69
         26 |         62        0.62       87.31
         28 |         51        0.51       87.82
         29 |         65        0.65       88.47
         30 |        108        1.08       89.55
         31 |         66        0.66       90.21
         32 |         56        0.56       90.77
         33 |         43        0.43       91.20
         35 |         30        0.30       91.50
         36 |         78        0.78       92.28
         38 |         23        0.23       92.51
         39 |         31        0.31       92.82
         40 |         63        0.63       93.45
         41 |         51        0.51       93.96
         42 |         10        0.10       94.06
         45 |         33        0.33       94.39
         47 |         29        0.29       94.68
         48 |          7        0.07       94.75
         50 |         27        0.27       95.02
         51 |         70        0.70       95.72
         52 |         14        0.14       95.86
         53 |         12        0.12       95.98
         54 |         72        0.72       96.70
         55 |         32        0.32       97.02
         56 |         27        0.27       97.29
         57 |         32        0.32       97.61
         64 |         23        0.23       97.84
         65 |         35        0.35       98.19
         67 |         20        0.20       98.39
         84 |         37        0.37       98.76
         90 |         49        0.49       99.25
         98 |         26        0.26       99.51
        102 |         24        0.24       99.75
        118 |         25        0.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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