Frequencies for first 10,000 rows of popprovm variable in nhamcsed1992 dataset :

Estimated # |
 of inscope |
  providers |
     in PSU |
   (masked) |      Freq.     Percent        Cum.
------------+-----------------------------------
        297 |        700        7.00        7.00
        300 |      3,411       34.11       41.11
        359 |      5,412       54.12       95.23
        398 |        477        4.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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