Frequencies for first 10,000 rows of retappt variable in nhamcsopd2002 dataset :

    return, |
      appt. |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      2,225       22.25       22.25
          1 |      7,775       77.75      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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