MUPLUS Keyword (MANOVA: Univariate command)

MUPLUS combines the constant term (μ) in the model with the term that is specified after it. The normal use of this specification is to obtain parameter estimates that represent weighted means for the levels of some factor. For example, MUPLUS SEED represents the constant, or overall, mean plus the effect for each level of SEED. The significance of such effects is usually uninteresting, but the parameter estimates represent the weighted means for each level of SEED, adjusted for any covariates in the model.

• MUPLUS cannot appear more than once on a given DESIGN subcommand.
• MUPLUS is the only way to get standard errors for the predicted mean for each level of the specified factor.
• Parameter estimates are not displayed by default; you must explicitly request them on the PRINT subcommand or via a CONTRAST subcommand.
• You can obtain the unweighted mean by specifying the full factorial model, excluding those terms that are contained by an effect, and prefixing the effect whose mean is to be found by MUPLUS.