Frequencies for first 10,000 rows of ageflag variable in namcs2014 dataset :

      Was patient age |
   calculated by NCHS |
          during data |
        processing or |
  recorded on instrum |      Freq.     Percent        Cum.
----------------------+-----------------------------------
    Birthdate imputed |         13        0.13        0.13
   Calculated by NCHS |      9,832       98.32       98.45
Entered by respondent |        155        1.55      100.00
----------------------+-----------------------------------
                Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017