Frequencies for first 10,000 rows of retappt variable in nhamcsopd1992 dataset :

  Return at |
  specified |
       time |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,151       31.51       31.51
          1 |      6,849       68.49      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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