Frequencies for first 10,000 rows of ager variable in namcs1998 dataset :

      patient age |
           recode |      Freq.     Percent        Cum.
------------------+-----------------------------------
   Under 15 years |      2,691       26.91       26.91
      15-24 years |        813        8.13       35.04
      25-44 years |      2,144       21.44       56.48
      45-64 years |      2,281       22.81       79.29
      65-74 years |      1,097       10.97       90.26
75 years and over |        974        9.74      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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