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 randomizations. They can be classified according to the types of multiple randomizations or according to kind of experiment that is involved. Examples for different kinds of experiments are as follows:

Multiphase experiments (also Multi-phase experiments)

Tobacco mosaic virus experiment (McIntyre, 1955), Potato storage experiment (Brien and Bailey, 2006, Example 13). See also experiments with a second phase in the laboratory.

Experiments with a second phase in the laboratory

Cotton fibre experiment (Cox, 1958, Example 3.2; Brien and Bailey, 2006, Example 4), Simple sensory experiment (Brien, 1983; Brien and Bailey, 2006, Example 1), Wine sensory experiments (Brien, May and Mayo, 1987), Milk sensory experiment (Wood, Williams and Speed, 1988, second example), Meatloaf tasting experiment, Knitted socks experiment (Brien and Bailey, 2006, Example 14), Nonorthogonal sensory experiment (Brien and Bailey, 2006, Example 15; 2009, Example 2), Corn seed germination experiment (Brien and Bailey, 2006, Example 12; 2010, Example 5), Wheat experiment (Brien and Bailey, 2006, Example 9; 2009, Example 5), Duplicated wheat experiment, Quality traits in plant breeding experiments (Smith et al., 2001; Cullis et al., 2003; Smith et al., 2006; Smith et al., 2011), Microarray experiments (Kerr, 2003; Jarrett and Ruggiero (2008)).

Storage-phase experiments

Potato storage experiment (Brien and Bailey, 2006, Example 13), Milk sensory experiment (Wood, Williams and Speed, 1988, second example), Apple storage experiment (Wilkinson et al, 2008).

Microarray experiments

Microarray experiments (Kerr, 2003, Section 5.1; Jarrett and Ruggiero (2008)).

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; 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)