Frequencies for first 10,000 rows of retprn variable in nhamcsopd1993 dataset :

  return if |
    needed, |
     p.r.n. |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,320       83.20       83.20
          1 |      1,680       16.80      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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