Frequencies for first 10,000 rows of econdp_5 variable in mort1975 dataset :

   econdp_5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         26        0.26        0.26
          2 |         75        0.75        1.01
          3 |        328        3.28        4.29
          4 |         97        0.97        5.26
          5 |      1,550       15.50       20.76
          . |      7,924       79.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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