Frequencies for first 10,000 rows of econds_9 variable in mort1975 dataset :

   econds_9 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,932       99.32       99.32
         01 |          6        0.06       99.38
         02 |         11        0.11       99.49
         03 |         15        0.15       99.64
         04 |          9        0.09       99.73
         05 |         10        0.10       99.83
         06 |         13        0.13       99.96
         07 |          3        0.03       99.99
         09 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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