Frequencies for first 10,000 rows of econdp_4 variable in mort1975 dataset :

   econdp_4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         64        0.64        0.64
          2 |        367        3.67        4.31
          3 |      1,081       10.81       15.12
          4 |        218        2.18       17.30
          5 |      2,370       23.70       41.00
          . |      5,900       59.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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