Frequencies for first 10,000 rows of popprovm variable in nhamcsopd1998 dataset :

  est. # of |
    inscope |
  providers |
     in psu |
   (masked) |      Freq.     Percent        Cum.
------------+-----------------------------------
        281 |      3,095       30.95       30.95
        323 |        968        9.68       40.63
        348 |      5,937       59.37      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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