Frequencies for first 10,000 rows of retappt variable in namcs2012 dataset :

  Return at |
  specified |
       time |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      2,959       29.59       29.59
        Yes |      7,041       70.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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