Frequencies for first 10,000 rows of edprn variable in nhamcsed1999 dataset :

  return to |
 ed, p.r.n. |
        (as |
needed)/app |
   ointment |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,774       77.74       77.74
          1 |      2,226       22.26      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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