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Example 24
Model 24b: Comparing Factor Means
Introducing explicit means and intercepts into a model raises additional questions
about which cross-group parameter constraints should be tested, and in what order.
This example shows how Amos constrains means and intercepts while fitting the factor
analysis model in Figure 24-1 on p. 364 to data from separate groups of girls and boys.
This is the same two-group factor analysis problem that was considered in Example
15. The results in Example 15 will be obtained here automatically.
Specifying the Model
E From the menus, choose File > Open.
E In the Open dialog box, double-click the file Ex24b.amw. In a typical installation, the
path will be:
C:\Program Files\IBM\SPSS\Amos\21\Examples\<language>\Ex24b.amw.
The path diagram is the same for boys as for girls and is shown below. Some regression
weights are fixed at 1. The means of all the unobserved variables are fixed at 0. In the
following section, you will remove the constraints on the girls’ factor means. The other
constraints (the ones that you do not remove) will remain in effect throughout the
analysis.
Figure 24-4: Two-factor model with explicit means and intercepts
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