Frequencies for first 10,000 rows of ager variable in nhamcsopd1998 dataset :

      patient age |
           recode |      Freq.     Percent        Cum.
------------------+-----------------------------------
   Under 15 years |      1,979       19.79       19.79
      15-24 years |      1,321       13.21       33.00
      25-44 years |      2,886       28.86       61.86
      45-64 years |      2,300       23.00       84.86
      65-74 years |        869        8.69       93.55
75 years and over |        645        6.45      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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