SUBJECT:  Simple chemical equilibrium
AUTHOR:   Paul Geiger
	  USC School of Medicine
SUPPORT:  pgeiger@vm.usc.edu
  
COMMENTS:
Create any working directory and copy materials into it.  Enter Stata.
Given any data set containing Ao, B0, Co, Do, Keq (e.g., equil.dta), 
type "do equil" to obtain a, b, c, x, Aeq, Beq, Ceq, Deq, and X_Ao.