Frequencies for first 10,000 rows of ager variable in nhamcsopd2010 dataset :

       age recode |      Freq.     Percent        Cum.
------------------+-----------------------------------
   under 15 years |      1,443       14.43       14.43
      15-24 years |        998        9.98       24.41
      25-44 years |      2,389       23.89       48.30
      45-64 years |      3,098       30.98       79.28
      65-74 years |      1,113       11.13       90.41
75 years and over |        959        9.59      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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