Frequencies for first 10,000 rows of paynochg variable in namcs2009 dataset :

  no charge |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,985       99.85       99.85
        yes |         15        0.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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