Frequencies for first 10,000 rows of popprovm variable in nhamcsopd1993 dataset :

estimated # |
 of inscope |
  providers |
     in psu |
   (masked) |      Freq.     Percent        Cum.
------------+-----------------------------------
        281 |      3,569       35.69       35.69
        297 |        808        8.08       43.77
        332 |      5,623       56.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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