Frequencies for first 10,000 rows of bdatefl variable in nhamcsopd1999 dataset :

  was birth |
       year |
   imputed? |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,878       98.78       98.78
          1 |        122        1.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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