Frequencies for first 10,000 rows of popprovm variable in nhamcsopd1999 dataset :

  est. # of |
    inscope |
  providers |
     in psu |
   (masked) |      Freq.     Percent        Cum.
------------+-----------------------------------
        293 |      3,760       37.60       37.60
        306 |        817        8.17       45.77
        345 |        131        1.31       47.08
        348 |      5,292       52.92      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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