Frequencies for first 10,000 rows of econdp_6 variable in mort1975 dataset :

   econdp_6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         13        0.13        0.13
          2 |         16        0.16        0.29
          3 |        103        1.03        1.32
          4 |         44        0.44        1.76
          5 |        754        7.54        9.30
          . |      9,070       90.70      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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