Frequencies for orec variable in person dataset :

       orec |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          6       25.00       25.00
          1 |          6       25.00       50.00
          2 |          6       25.00       75.00
          3 |          6       25.00      100.00
------------+-----------------------------------
      Total |         24      100.00

by Jean Roth , jroth@nber.org , 2 May 2016