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Sörbom’s Alternative to Analysis of Covariance
Changing the Default Behavior
E From the menus, choose View > Analysis Properties.
E
In the Analysis Properties dialog box, click the Bias tab.
The default setting used by Amos yields results that are consistent with missing data
modeling (discussed in Example 17 and Example 18). Other SEM programs like
LISREL (Jöreskog and Sörbom, 1989) and EQS (Bentler, 1985) analyze unbiased
moments instead, resulting in slightly different results when sample sizes are small.
Selecting both
Unbiased options on the Bias tab causes Amos to produce the same
estimates as LISREL or EQS. Appendix B discusses further the tradeoffs in choosing
whether to fit the maximum likelihood estimate of the covariance matrix or the
unbiased estimate.
Model A
Specifying the Model
Consider Sörbom’s initial model (Model A) for the Olsson data. The path diagram for
the control group is: