Frequencies for first 10,000 rows of hgba variable in nhamcsopd2007 dataset :

     hgba1c |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,748       97.48       97.48
        yes |        252        2.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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