JMP 12 Design of Experiments Guide

The Model Matrix

The model matrix for a design describes the settings for all effects in the model:

• The model matrix has a row for each run and a column for each term of the model specified in the Model outline.

• For each run, the corresponding row of the model matrix contains the coded values of the model terms.

• Continuous terms are coded to range from -1 to 1. Nominal terms are coded by applying the Gram-Schmidt orthogonalization procedure to JMP’s coding for nominal effects. See “Coding for Nominal Effects” in the Fitting Linear Models book.

You can view a design’s model matrix in two ways:

1. If you create the design using Custom Design, select Save X Matrix from the red triangle menu in the Custom Design window. In the design table ...