Frequencies for first 10,000 rows of econds_3 variable in mort1975 dataset :

   econds_3 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      3,163       31.63       31.63
         01 |      5,061       50.61       82.24
         02 |      1,528       15.28       97.52
         03 |        248        2.48      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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