Frequencies for first 10,000 rows of bdatefl variable in nhamcsopd2001 dataset :

was patient |
 birth date |
   imputed? |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,910       99.10       99.10
          1 |         90        0.90      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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