Frequencies for first 10,000 rows of retappt variable in nhamcsopd2009 dataset :

    return, |
      appt. |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      2,566       25.66       25.66
        yes |      7,434       74.34      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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