Frequencies for first 10,000 rows of age_cod variable in demo2009q4 dataset :

       Unit |
abbreviatio |
      n for |
  patient's |
        age |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      4,857       48.57       48.57
        DEC |         14        0.14       48.71
         DY |         91        0.91       49.62
         HR |          2        0.02       49.64
        MON |        159        1.59       51.23
         WK |          8        0.08       51.31
         YR |      4,869       48.69      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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