Frequencies for age_ref_ variable in fmli011 dataset :

   age_ref_ |      Freq.     Percent        Cum.
------------+-----------------------------------
          D |      7,680       99.59       99.59
          T |         32        0.41      100.00
------------+-----------------------------------
      Total |      7,712      100.00

by Jean Roth , jroth@nber.org , 17 Mar 2016