Frequencies for first 10,000 rows of ager variable in nhamcsopd1997 dataset :

      patient age |
           recode |      Freq.     Percent        Cum.
------------------+-----------------------------------
   Under 15 years |      1,868       18.68       18.68
      15-24 years |      1,363       13.63       32.31
      25-44 years |      3,047       30.47       62.78
      45-64 years |      2,387       23.87       86.65
      65-74 years |        785        7.85       94.50
75 years and over |        550        5.50      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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