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

estimated # |
 of inscope |
  providers |
     in psu |
   (masked) |      Freq.     Percent        Cum.
------------+-----------------------------------
        293 |      3,614       36.14       36.14
        314 |        818        8.18       44.32
        348 |      5,568       55.68      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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