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Testing Hypotheses
E
To perform the analysis, from the menus, choose File > Run.
Timing Is Everything
The AStructure lines must appear after BeginGroup; otherwise, Amos will not recognize
that the variables named in the
AStructure lines are observed variables in the
attg_yng.sav dataset.
In general, the order of statements matters in an Amos program. In organizing an
Amos program, AmosEngine methods can be divided into three general groups
1
.
Group 1 — Declarative Methods
This group contains methods that tell Amos what results to compute and display.
TextOutput is a Group 1 method, as are Standardized, ImpliedMoments, SampleMoments,
and ResidualMoments. Many other Group 1 methods that are not used in this example
are documented in the Amos 21 Programming Reference Guide.
Group 2 — Data and Model Specification Methods
This group consists of data description and model specification commands.
BeginGroup and AStructure are Group 2 methods. Others are documented in the Amos
21 Programming Reference Guide.
Group 3 — Methods for Retrieving Results
These are commands to…well, retrieve results. So far, we have not used any Group 3
methods. Examples using Group 3 methods are given in the Amos 21 Programming
Reference Guide.
Tip: When you write an Amos program, it is important to pay close attention to the
order in which you call the Amos engine methods. The rule is that groups must appear
in order: Group 1, then Group 2, and finally Group 3.
For more detailed information about timing rules and a complete listing of methods and
their group membership, see the Amos 21 Programming Reference Guide.
1 There is also a fourth special group, consisting of only the Initialize Method. If the optional Initialize Method
is used, it must come before the Group 1 methods.