Frequencies for first 10,000 rows of retprn variable in nhamcsopd2006 dataset :

 return prn |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      8,226       82.26       82.26
        Yes |      1,774       17.74      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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