Frequencies for first 10,000 rows of ager variable in nhamcsopd2000 dataset :

      patient age |
           recode |      Freq.     Percent        Cum.
------------------+-----------------------------------
   Under 15 years |      1,809       18.09       18.09
      15-24 years |      1,072       10.72       28.81
      25-44 years |      2,800       28.00       56.81
      45-64 years |      2,592       25.92       82.73
      65-74 years |        980        9.80       92.53
75 years and over |        747        7.47      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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