Frequencies for first 10,000 rows of activity variable in mortterr2007 dataset :

   Activity |
       code |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          2        0.02        0.02
          1 |          1        0.01        0.03
          9 |        534        5.34        5.37
          . |      9,463       94.63      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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