Frequencies for first 10,000 rows of retappt variable in nhamcsopd2003 dataset :

    return, |
      appt. |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      2,682       26.82       26.82
        yes |      7,318       73.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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