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

referred to |
    another |
  physician |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,455       94.55       94.55
          1 |        545        5.45      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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