Frequencies for first 10,000 rows of retappt variable in nhamcsopd2005 dataset :

    return, |
      appt. |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      2,689       26.89       26.89
        yes |      7,311       73.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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