Frequencies for first 10,000 rows of paynochg variable in nhamcsed2006 dataset :

  no charge |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,835       98.35       98.35
        yes |        165        1.65      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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