Frequencies for first 10,000 rows of dayda1c variable in namcs2010 dataset :

     difference in days |
 between visit and most |
     recent hgba1c draw |      Freq.     Percent        Cum.
------------------------+-----------------------------------
                     -9 |     10,000      100.00      100.00
------------------------+-----------------------------------
                  Total |     10,000      100.00

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