Frequencies for first 10,000 rows of retprn variable in namcs2004 dataset :

  return if |
    needed, |
     p.r.n. |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,746       77.46       77.46
          1 |      2,254       22.54      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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