Frequencies for first 10,000 rows of econdp_7 variable in mort1975 dataset :

   econdp_7 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          6        0.06        0.06
          2 |          4        0.04        0.10
          3 |         27        0.27        0.37
          4 |         25        0.25        0.62
          5 |        317        3.17        3.79
          . |      9,621       96.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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