Frequencies for first 10,000 rows of bdatefl variable in nhamcsopd2002 dataset :

was patient |
 birth date |
   imputed? |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,558       95.58       95.58
          1 |        442        4.42      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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