Frequencies for first 10,000 rows of econds_4 variable in mort1975 dataset :

   econds_4 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      5,900       59.00       59.00
         01 |      2,461       24.61       83.61
         02 |      1,250       12.50       96.11
         03 |        323        3.23       99.34
         04 |         66        0.66      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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