ABSTRACT
In Chapters 23 through 25, we studied mixture experiments whereby an ingredient was either absent or present as a pure or binary blend. In some cases, an acceptable mixture can only be achieved when an ingredient is present in a minimum amount. For example, let’s suppose we have three ingredients, and each ingredient must have a minimum amount present to create a valid mixture. Let’s say ingredients x1, x2, and x3 must contain at least 25%, 20%, and 15% by proportion. The lower bounds, L1, L2, L3 are shown for each ingredient.
