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Erschienen in:
2008 | OriginalPaper | Buchkapitel
Completely Randomized Designs
Erschienen in: Statistical Design
Verlag: Springer New York
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A theoretical consequence of the fact that all factors in a CRD must be fixed factors is that we can study the theory for
all
CRD simply by looking at the oneway CRD. This follows because of the simple error structure of the CRD, and the fact that any effect can be built up through contrasts. However, this fact is only useful as a theoretical tool, say when we are trying to develop some distributional properties, as the data layout and the treatment structure always play an important practical role. But the oneway CRD is the place to start.
Most importantly, the randomization structure of the CRD implies that there is only one error term, the within error, and all effects are tested against it.