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

# of clinic |
   sampling |
   units in |
   hospital |
   (masked) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,517       35.17       35.17
          6 |        293        2.93       38.10
          8 |        157        1.57       39.67
          9 |        170        1.70       41.37
         10 |        696        6.96       48.33
         11 |        319        3.19       51.52
         13 |        628        6.28       57.80
         14 |        107        1.07       58.87
         15 |        172        1.72       60.59
         16 |        164        1.64       62.23
         17 |        302        3.02       65.25
         19 |        342        3.42       68.67
         20 |        162        1.62       70.29
         22 |        145        1.45       71.74
         23 |        151        1.51       73.25
         26 |        108        1.08       74.33
         28 |        291        2.91       77.24
         31 |        253        2.53       79.77
         32 |        140        1.40       81.17
         40 |         89        0.89       82.06
         41 |        109        1.09       83.15
         42 |        421        4.21       87.36
         57 |        115        1.15       88.51
         59 |        250        2.50       91.01
         62 |         44        0.44       91.45
         64 |         97        0.97       92.42
         66 |        170        1.70       94.12
         67 |        168        1.68       95.80
         75 |         45        0.45       96.25
        118 |        375        3.75      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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