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Exploratory Factor Analysis by Specification Search
and Backward searches are alternated until one Forward or Backward search is
completed with no improvement.
Performing a Stepwise Search
E Click the Options button on the Specification Search toolbar.
E In the Options dialog box, click the Next search tab.
E Select Stepwise.
E On the Specification Search toolbar, click .
The results in Figure 23-7 suggest examining the 13-parameter model, Model 7. Its
discrepancy C is much smaller than the discrepancy for the best 12-parameter model
and not much larger than the best 14-parameter model. Model 7 is also best according
to both BCC and BIC. (Your results may differ from those in the figure because of an
element of randomness in the heuristic specification search algorithms. When adding
an arrow during a forward step or removing an arrow during a backward step, there
may not be a unique best choice. In that case, one arrow is picked at random from
among the arrows that are tied for best.)
Figure 23-7: Results of stepwise specification search