Design of Experiments - US Army Conference on Applied Statistics

Constraints on the mixture components are common, <strong>of</strong>ten in the
form <strong>of</strong> lower and upper bounds on component proportions
The effect <strong>of</strong> these constraints is to alter the shape <strong>of</strong> the original
simplex region
If there are only lower bounds, the simplex designs shown previously
will still work
If there are both lower and upper bounds, simplex designs will not work
for these types <strong>of</strong> problems