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Example 10
About the Data
We will use Attig’s memory data from both young and old subjects. Following is a
partial listing of the old subjects’ data found in the worksheet Attg_old located in the
Microsoft Excel workbook UserGuide.xls:
The young subjects’ data are in the Attg_yng worksheet. This example uses only the
measures recall1 and cued1.
Data for multigroup analysis can be organized in a variety of ways. One option is to
separate the data into different files, with one file for each group (as we have done in
this example). A second possibility is to keep all the data in one big file and include a
group membership variable.
Model A
We will begin with a truly trivial model (Model A) for two variables: recall1 and
cued1. The model simply says that, for young subjects as well as old subjects, recall1
and cued1 are two variables that have some unspecified variances and some
unspecified covariance. The variances and the covariance are allowed to be different
for young and old people.