Frequencies for first 10,000 rows of age_cod variable in demo2005q2 dataset :

       Unit |
abbreviatio |
      n for |
  patient's |
        age |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      2,913       29.13       29.13
        DEC |          3        0.03       29.16
         DY |         23        0.23       29.39
        MON |         53        0.53       29.92
         WK |          6        0.06       29.98
         YR |      7,002       70.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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