Frequencies for first 10,000 rows of retappt variable in nhamcsopd2000 dataset :

  return to |
    clinic, |
      appt. |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,472       34.72       34.72
          1 |      6,528       65.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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