Frequencies for first 10,000 rows of ager variable in nhamcsed1999 dataset :

      patient age |
           recode |      Freq.     Percent        Cum.
------------------+-----------------------------------
   Under 15 years |      2,046       20.46       20.46
      15-24 years |      1,421       14.21       34.67
      25-44 years |      3,309       33.09       67.76
      45-64 years |      1,824       18.24       86.00
      65-74 years |        585        5.85       91.85
75 years and over |        815        8.15      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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