Frequencies for first 10,000 rows of econds_2 variable in mort1975 dataset :

   econds_2 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        950        9.50        9.50
         01 |      7,712       77.12       86.62
         02 |      1,338       13.38      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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