ANOVA , ANCOVA and Mixed Effects Models Week
نویسنده
چکیده
A grouping or blocking of observations can be achieved by using categorical or dummy variables. Examples of categorical variables include gender, country of origin, job title and experimental treatment. This should be contrasted with ordinal variables, such as age class, highest degree attained or a score on a 5-point scale with values comprised between strongly agree and strongly disagree. The matrix X is usually referred to as the design matrix, because it specifies the experimental design. For instance, if considering a one-way analysis of variance (ANOVA) over three different groups, where we have 2 subjects in each group. We may select one of the following two design matrices,
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