Frequencies for first 10,000 rows of popprovm variable in nhamcsed1993 dataset :

estimated # |
 of inscope |
  providers |
     in psu |
   (masked) |      Freq.     Percent        Cum.
------------+-----------------------------------
        281 |      3,430       34.30       34.30
        297 |      1,808       18.08       52.38
        332 |      4,568       45.68       98.06
        360 |        194        1.94      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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