Frequencies for first 10,000 rows of refothph variable in namcs1994 dataset :

referred to |
    another |
  physician |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,426       94.26       94.26
          1 |        574        5.74      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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