Frequencies for first 10,000 rows of retappt variable in nhamcsopd2006 dataset :

    return, |
      appt. |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      2,734       27.34       27.34
        Yes |      7,266       72.66      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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