Frequencies for first 10,000 rows of ager variable in namcs1999 dataset :

      patient age |
           recode |      Freq.     Percent        Cum.
------------------+-----------------------------------
   Under 15 years |      1,128       11.28       11.28
      15-24 years |        841        8.41       19.69
      25-44 years |      2,512       25.12       44.81
      45-64 years |      2,860       28.60       73.41
      65-74 years |      1,292       12.92       86.33
75 years and over |      1,367       13.67      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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