Frequencies for first 10,000 rows of su variable in nhamcsopd1996 dataset :

   hospital |
   sampling |
  unit code |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,656       16.56       16.56
          2 |        877        8.77       25.33
          3 |        650        6.50       31.83
          4 |        772        7.72       39.55
          5 |        689        6.89       46.44
          6 |        482        4.82       51.26
          7 |        399        3.99       55.25
          8 |        532        5.32       60.57
          9 |        203        2.03       62.60
         10 |        337        3.37       65.97
         11 |        309        3.09       69.06
         12 |        292        2.92       71.98
         13 |        221        2.21       74.19
         14 |        196        1.96       76.15
         15 |        203        2.03       78.18
         16 |        123        1.23       79.41
         17 |         89        0.89       80.30
         18 |        125        1.25       81.55
         19 |        155        1.55       83.10
         20 |         59        0.59       83.69
         21 |         30        0.30       83.99
         22 |         83        0.83       84.82
         23 |        120        1.20       86.02
         24 |         55        0.55       86.57
         25 |         90        0.90       87.47
         26 |         66        0.66       88.13
         28 |         29        0.29       88.42
         29 |          6        0.06       88.48
         31 |        106        1.06       89.54
         32 |         64        0.64       90.18
         33 |         22        0.22       90.40
         35 |         75        0.75       91.15
         36 |         45        0.45       91.60
         37 |         50        0.50       92.10
         38 |         33        0.33       92.43
         39 |         31        0.31       92.74
         41 |         50        0.50       93.24
         42 |         72        0.72       93.96
         43 |         29        0.29       94.25
         44 |         23        0.23       94.48
         45 |         28        0.28       94.76
         46 |         26        0.26       95.02
         47 |         56        0.56       95.58
         53 |         12        0.12       95.70
         54 |         50        0.50       96.20
         55 |         96        0.96       97.16
         60 |         28        0.28       97.44
         68 |         18        0.18       97.62
         69 |         32        0.32       97.94
         70 |         25        0.25       98.19
         72 |         40        0.40       98.59
         82 |         40        0.40       98.99
         84 |         43        0.43       99.42
         90 |         18        0.18       99.60
        103 |         15        0.15       99.75
        123 |         25        0.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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