Frequencies for first 10,000 rows of retprn variable in nhamcsed2005 dataset :

  return if |
     needed |
prn/appoint |
       ment |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      5,648       56.48       56.48
        yes |      4,352       43.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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