Frequencies for first 10,000 rows of econdp_3 variable in mort1975 dataset :

   econdp_3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        244        2.44        2.44
          2 |      1,633       16.33       18.77
          3 |      2,956       29.56       48.33
          4 |         18        0.18       48.51
          5 |      1,986       19.86       68.37
          . |      3,163       31.63      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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