Frequencies for first 10,000 rows of ager variable in nhamcsopd1999 dataset :

      patient age |
           recode |      Freq.     Percent        Cum.
------------------+-----------------------------------
   Under 15 years |      2,041       20.41       20.41
      15-24 years |      1,353       13.53       33.94
      25-44 years |      2,926       29.26       63.20
      45-64 years |      2,296       22.96       86.16
      65-74 years |        789        7.89       94.05
75 years and over |        595        5.95      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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