Design & Factor Selection
Design Types & Categories
Quantitative Factors - Quantitative factors have a natural order that may be quantified, such as weight or distance. Often they are referred to as continuous variables or as being variable data. Quantitative factors may be measured as an interval between levels or with respect to some common origin. In some cases, qualitative information may be expressed quantitatively for the purposes of analysis, such as setting slow = 0, medium = 7 and fast = 10. Such a quantification need not be related to any recognized scale, but should be spaced realistically. Quantitative factors can describe a specific response curve or surface, whereas the shape of the response to qualitative factors depends on an arbitrary factor ordering
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