Abstract: In many applications of mixture experiments in medicine or biology, for example, not only the proportions of the involved mixture ingredients, but also their total amount is of particular interest. This calls for designs in mixture amount models, which are obtained from classical mixture setups by including terms capturing the total amount, simultaneously dropping the sidecondition on the proportions to sum up to one. While design optimality usually depends sensitively on the underlying model, we establish here a close relation between admissible mixture, and admissible mixture amount designs in additive and homogeneous models. This particularly allows to obtain-,
- and
-optimal mixture amount from optimal mixture designs, and vice versa. We present some examples for Becker's and Scheffé's mixture models.
Key words and phrases: Admissibility,-optimality, mixture amount experiments, mixture experiments,