Frequencies for first 10,000 rows of retprn variable in nhamcsopd2001 dataset :

  return as |
     needed |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,352       83.52       83.52
          1 |      1,648       16.48      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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