Get multiple trials with identical subject/item combinations

Sometimes we want to repeat a design, that is, have multiple trials with identical values, but it is not always straight forward to implement. For instance, there is no way to easily modify MultiSubjectDesign to have multiple identical subject/item combinations, without doing awkward repetitions of condition-levels or something.

If you struggle with this problem RepeatDesign is an easy tool for you:

using UnfoldSim

designOnce = MultiSubjectDesign(;
    n_items = 2,
    n_subjects = 2,
    subjects_between = Dict(:cond => ["levelA", "levelB"]),
    items_between = Dict(:cond => ["levelA", "levelB"]),
);

design = RepeatDesign(designOnce, 4);
generate_events(design)

8×3 DataFrame

Row	subject	cond	item
	String	String	String
1	S1	levelA	I1
2	S1	levelA	I1
3	S1	levelA	I1
4	S1	levelA	I1
5	S2	levelB	I2
6	S2	levelB	I2
7	S2	levelB	I2
8	S2	levelB	I2

As you can see, the design was simply repeated.

Note

If you implemented your own AbstractDesign, you need to define the size function accordingly. E.g.: Base.size(design::RepeatDesign{SingleSubjectDesign}) = size(design.design).*design.repeat

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