Model Browser User's Guide

Z2 Matrix

Z₂ : Matrix of terms that have been removed from the model. If you haven't removed any terms, the main display is blank apart from the message "All terms are currently included in the model."

Alias Matrix

Like the Z₂ matrix, the alias matrix also displays terms that are not included in the model (and is therefore not available if all terms are included in the model). The purpose of the alias matrix is to show the pattern of confounding in the design.

A zero in a box indicates that the row term (currently included in the model) is not confounded with the column term (currently not in the model). A complete row of zeros indicates that the term in the model is not confounded with any of the terms excluded from the model. A column of zeros also indicates that the column term (currently not in the model) could be included (but at the cost of a reduction in the residual degrees of freedom).

A: the alias matrix is defined by the expression

Z2.1 Matrix

As this matrix also uses the terms not included in the model, it is not available if all terms are included.

Z_2.1 : matrix defined by the expression

Regression Matrix

Regression matrix. Consists of terms included in the model. matrix where n is the number of test points in the design and p is the number of terms in the model.

Design Matrix

Coefficient Information