Frequencies for first 10,000 rows of econds_12 variable in mort1975 dataset :

  econds_12 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,998       99.98       99.98
         04 |          1        0.01       99.99
         06 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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