Frequencies for first 10,000 rows of ager variable in namcs2000 dataset :

      patient age |
           recode |      Freq.     Percent        Cum.
------------------+-----------------------------------
   Under 15 years |      2,713       27.13       27.13
      15-24 years |        733        7.33       34.46
      25-44 years |      2,066       20.66       55.12
      45-64 years |      2,425       24.25       79.37
      65-74 years |      1,037       10.37       89.74
75 years and over |      1,026       10.26      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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