Frequencies for first 10,000 rows of popprovm variable in nhamcsed1995 dataset :

estimated # |
 of inscope |
  providers |
     in psu |
   (masked) |      Freq.     Percent        Cum.
------------+-----------------------------------
        306 |      4,435       44.35       44.35
        343 |      3,220       32.20       76.55
        360 |      2,345       23.45      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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