Frequencies for first 10,000 rows of econds_7 variable in mort1975 dataset :

   econds_7 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,621       96.21       96.21
         01 |         65        0.65       96.86
         02 |        110        1.10       97.96
         03 |        109        1.09       99.05
         04 |         67        0.67       99.72
         05 |         21        0.21       99.93
         06 |          1        0.01       99.94
         07 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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