Frequencies for first 10,000 rows of popprovm variable in namcs1995 dataset :

estimated # |
 of inscope |
  providers |
     in psu |
   (masked) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,612       56.12       56.12
     248212 |      1,891       18.91       75.03
     669499 |      1,185       11.85       86.88
     930040 |      1,312       13.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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