Frequencies for first 10,000 rows of refothmd variable in namcs2001 dataset :

referred to |
    another |
  physician |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,502       95.02       95.02
          1 |        498        4.98      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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