A More Complex Model
We also note that this first model has a modest Rsquare and the points scatter well away from the estimated plane. We can improve the model by adding the third predictor variable: slag. Slag is another "cementitious" component of concrete mixes that serves to bind the mixture together.
Return to the Fit Model dialog box (still open behind your results) and Add Slag to the list of Model Effects.
Change the Emphasis from Minimal Report to Effect Screening; we do this to request additional output that helps us decide which factors are influential.
The first portion of the results is a group of four graphs. Let's first consider the graph on the far left, bypassing the others until a later section. The first graph (Figure 15.6 ...
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