Amos 16.0 user's guide. by James L. Arbuckle

By James L. Arbuckle

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12 Chapter 3 Creating a New Model E From the menus, choose File → New. Your work area appears. The large area on the right is where you draw path diagrams. The toolbar on the left provides one-click access to the most frequently used buttons. You can use either the toolbar or menu commands for most operations. 13 Tutorial: Getting Started with Amos Graphics Specifying the Data File The next step is to specify the file that contains the Hamilton data. sav files. If you launch Amos from the Analyze menu in SPSS, Amos automatically uses the file that is open in SPSS.

Note: For many interesting applications of Amos, there is no exact test or exact standard error or exact confidence interval available. On the bright side, when fitting a model for which conventional estimates exist, maximum likelihood point estimates (for example, the numbers in the Estimate column) are generally identical to the conventional estimates. E Now click Notes for Model in the upper left pane of the Amos Output window. The following table plays an important role in every Amos analysis: Number of distinct sample moments: Number of distinct parameters to be estimated: Degrees of freedom (10 – 10): 10 10 0 34 Example 1 The Number of distinct sample moments referred to are sample means, variances, and covariances.

The Degrees of freedom is the amount by which the number of sample moments exceeds the number of parameters to be estimated. In this example, there is a one-toone correspondence between the sample moments and the parameters to be estimated, so it is no accident that there are zero degrees of freedom. As we will see beginning with Example 2, any nontrivial null hypothesis about the parameters reduces the number of parameters that have to be estimated. The result will be positive degrees of freedom.

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