Frequencies for first 10,000 rows of age_cod variable in demo2004q1 dataset :

       Unit |
abbreviatio |
      n for |
  patient's |
        age |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      2,083       20.83       20.83
        DEC |          6        0.06       20.89
         DY |         35        0.35       21.24
         HR |          1        0.01       21.25
        MON |         65        0.65       21.90
         WK |         13        0.13       22.03
         YR |      7,797       77.97      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Dec 2015