Frequencies for first 10,000 rows of popprovm variable in nhamcsed1999 dataset :

estimated # |
 of inscope |
  providers |
     in psu |
   (masked) |      Freq.     Percent        Cum.
------------+-----------------------------------
        293 |      2,539       25.39       25.39
        306 |      2,014       20.14       45.53
        345 |      2,357       23.57       69.10
        348 |      3,090       30.90      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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