Frequencies for first 10,000 rows of activity variable in mort2006 dataset :

   Activity |
       code |      Freq.     Percent        Cum.
------------+-----------------------------------
          9 |        650        6.50        6.50
          . |      9,350       93.50      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015