Frequencies for first 10,000 rows of bdatefl variable in namcs1996 dataset :

        was |
  patient's |
 birth year |
   imputed? |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,782       97.82       97.82
          1 |        218        2.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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