Frequencies for first 10,000 rows of retappt variable in nhamcsopd2011 dataset :

  Return at |
  specified |
       time |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      1,992       19.92       19.92
        Yes |      8,008       80.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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