Frequencies for first 10,000 rows of retappt variable in namcs2007 dataset :

    return, |
      appt. |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      4,063       40.63       40.63
        yes |      5,937       59.37      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016