Frequencies for first 10,000 rows of bdatefl variable in nhamcsopd2005 dataset :

 birth date |
   imputed? |      Freq.     Percent        Cum.
------------+-----------------------------------
not imputed |      9,943       99.43       99.43
    imputed |         57        0.57      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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