Frequencies for first 10,000 rows of bdatefl variable in nhamcsed2007 dataset :

 birth date |
   imputed? |      Freq.     Percent        Cum.
------------+-----------------------------------
not imputed |      9,852       98.52       98.52
    imputed |        148        1.48      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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