Frequencies for first 10,000 rows of retprn variable in nhamcsed2009 dataset :

  return if |
     needed |
prn/appoint |
       ment |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,157       71.57       71.57
          1 |      2,843       28.43      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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