Frequencies for first 10,000 rows of bdatefl variable in nhamcsed1999 dataset :

  was birth |
       year |
   imputed? |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,682       96.82       96.82
          1 |        318        3.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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