Frequencies for first 10,000 rows of su variable in nhamcsopd1994 dataset :

   hospital |
   sampling |
  unit code |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,463       14.63       14.63
          2 |      1,290       12.90       27.53
          3 |         78        0.78       28.31
          4 |        749        7.49       35.80
          5 |      1,319       13.19       48.99
          7 |        387        3.87       52.86
          8 |        438        4.38       57.24
          9 |        253        2.53       59.77
         10 |        361        3.61       63.38
         11 |        544        5.44       68.82
         12 |        260        2.60       71.42
         13 |        138        1.38       72.80
         14 |        230        2.30       75.10
         15 |        121        1.21       76.31
         16 |        149        1.49       77.80
         23 |        216        2.16       79.96
         24 |        305        3.05       83.01
         25 |        292        2.92       85.93
         26 |        181        1.81       87.74
         27 |         96        0.96       88.70
         32 |        130        1.30       90.00
         36 |        172        1.72       91.72
         37 |        158        1.58       93.30
         40 |        148        1.48       94.78
         75 |        162        1.62       96.40
        112 |        165        1.65       98.05
        119 |        195        1.95      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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