Frequencies for first 10,000 rows of popprovm variable in nhamcsed1994 dataset :

estimated # |
 of inscope |
  providers |
     in psu |
   (masked) |      Freq.     Percent        Cum.
------------+-----------------------------------
        293 |      2,904       29.04       29.04
        314 |      2,409       24.09       53.13
        348 |      4,066       40.66       93.79
        360 |        621        6.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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