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

referred to |
      other |
physician/c |
      linic |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,241       52.41       52.41
          1 |      4,759       47.59      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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