Frequencies for first 10,000 rows of popprovm variable in nhamcsed1997 dataset :

estimated # |
 of inscope |
  providers |
     in psu |
   (masked) |      Freq.     Percent        Cum.
------------+-----------------------------------
        300 |      2,496       24.96       24.96
        306 |      1,921       19.21       44.17
        348 |      3,384       33.84       78.01
        353 |      2,199       21.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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