shrinkage simplex-centroid designs for a quadratic mixture model

A simplex-centroid design for q mixture components comprises of all possible subsets of the qcomponents, present in equal proportions. the design does not contain full mixture blends except the overall centroid. in real-life situations, all mixture blends comprise of at least a minimum proportion of each component. here, we introduce simplex-centroid designs which contain complete blends but with some loss in d-efficiency and stability in g-efficiency. we call such designs as shrinkage simplex-centroid designs. furthermore, we use the proposed designs to generate component-amount designs by their projection.