Frequencies for first 10,000 rows of retprn variable in namcs2006 dataset :

 return prn |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      6,648       66.48       66.48
        yes |      3,352       33.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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