Frequencies for first 10,000 rows of popprovm variable in namcs1994 dataset :

estimated # |
 of inscope |
  providers |
     in psu |
   (masked) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,152       51.52       51.52
       5646 |      2,043       20.43       71.95
      10430 |        550        5.50       77.45
      12511 |        761        7.61       85.06
      19169 |      1,494       14.94      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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