Kinds and examples of multitiered experiments

Multitiered experiments are not a fundamentally new class of experiments, but are a drawing together of existing experimental kinds that have in common that they involve multiple allocations/randomizations. They can be classified according to the types of multiple allocations or according to kind of experiment that is involved. Examples for different kinds of experiments are as follows:

Multiphase experiments (also Multi-phase experiments)

Multiphase experiments are possibly the most commonly occurring kind of multitiered experiment. Brien (2017c) gives a review of multiphase experiments and some highlights from it are available here, including lists of examples.

Human-interaction experiments

Human-computer experiment (Brien and Bailey, 2006, Example 7), Paired human-interaction experiment (Lewis, 2006).

Single-stage experiments

Horticultural experiment (Preece, 1991)), A plant experiment (Brien and Bailey, 2006, Example 5; 2010, Example 3), Continuous grazing experiment (Brien and Bailey, 2006, Example 3), Rotational grazing experiment (Brien and Bailey, 2006, Example 8; 2010, Example 4), Drug-testing experiment (White, 1975, example 2).

Multistage reprocessing or same-unit experiments

Laundry experiments (Miller, 1997); Semiconductor fabrication experiments (Mee and Bates, 1998).

Some superimposed experiments

A superimposed experiment using split plots (Brien and Bailey, 2006, Example 6), Superimposed experiment using a row-column design (Brien and Bailey, 2006, Example 10; 2010, Example 1).

Grazing trials and some other animal experiments

Continuous grazing experiment (Brien, C.J., and Demétrio, C.G.B., 1998b; Brien and Bailey, 2006, Example 3), Improperly-replicated continuous grazing experiment (Brien, C.J., and Demétrio, C.G.B., 1998a; 1998b), Rotational grazing experiment (Brien, C.J., and Demétrio, C.G.B., 1998b; Brien and Bailey, 2006, Example 8; 2010, Example 4), Rotational grazing experiment in a randomized complete block design (Brien, C.J., and Demétrio, C.G.B., 1998b), Supplementary feed trials (Brien, C.J., and Demétrio, C.G.B., 1998b), Drug-testing experiment (White, 1975, example 2).

Some plant experiments

A plant experiment (Brien and Bailey, 2006, Example 5; 2010, Example 3), Horticultural experiment (Preece, 1991), Tobacco mosaic virus experiment (McIntyre, 1955).