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Example 23
Viewing the Scree Plot
E Click on the Specification Search toolbar.
E In the Plot window, select Scree in the Plot type group.
The scree plot confirms that adding a 13
th
parameter provides a substantial reduction
in discrepancy and that adding additional parameters beyond the 13
th
provides only
slight reductions.
Figure 23-8: Scree plot after stepwise specification search
E
Click the point in the scree plot with horizontal coordinate 13, as in Figure 23-8. The
pop-up that appears shows that Model 7 is the best 13-parameter model.
E Click 7 (25.62) on the pop-up. This displays the path diagram for Model 7 in the
drawing area.
Tip: You can also do this by double-clicking the row for Model 7 in the Specification
Search window.