Frequencies for first 10,000 rows of hgba variable in nhamcsed2002 dataset :

     hgba1c |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,788       97.88       97.88
          1 |        212        2.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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