Frequencies for first 10,000 rows of popprovm variable in nhamcsopd2000 dataset :

  est. # of |
    inscope |
  providers |
     in psu |
   (masked) |      Freq.     Percent        Cum.
------------+-----------------------------------
        289 |        660        6.60        6.60
        293 |      3,959       39.59       46.19
        327 |      5,264       52.64       98.83
        330 |        117        1.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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