Frequencies for first 10,000 rows of popprovm variable in nhamcsed2000 dataset :

estimated # |
 of inscope |
  providers |
     in psu |
   (masked) |      Freq.     Percent        Cum.
------------+-----------------------------------
        289 |      2,174       21.74       21.74
        293 |      2,901       29.01       50.75
        327 |      3,958       39.58       90.33
        330 |        967        9.67      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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