Frequencies for first 10,000 rows of retprn variable in nhamcsopd2000 dataset :

  return to |
    clinic, |
 p.r.n. (as |
    needed) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,341       83.41       83.41
          1 |      1,659       16.59      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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