Frequencies for first 10,000 rows of bdatefl variable in namcs2012 dataset :

        Was |
   variable |
   imputed: |
 birth year |      Freq.     Percent        Cum.
------------+-----------------------------------
Not imputed |      9,962       99.62       99.62
    Imputed |         38        0.38      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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