Frequencies for interi variable in fmli132 dataset :

     interi |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |      1,700       25.14       25.14
          3 |      1,694       25.05       50.19
          4 |      1,622       23.99       74.18
          5 |      1,746       25.82      100.00
------------+-----------------------------------
      Total |      6,762      100.00

by Jean Roth , jroth@nber.org , 17 Mar 2016