Frequencies for first 10,000 rows of refothph variable in nhamcsopd1994 dataset :

   refer to |
      other |
phys/clinic |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,115       91.15       91.15
          1 |        885        8.85      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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