Covariance matrices can be defined in text files using a set of keywords and your data. Use the keyword “COVARIANCE” to start a tab-separated block containing your covariance matrix. It is sufficient to enter the lower diagonal of the matrix because it is symmetric. Use the keyword “OBSERVED VARIABLES” to start a block containing the tab-separated names of your variables. Use a keyword “SAMPLE SIZE” to start a block containing the numeric sample size.

Here is an example:

COVARIANCE

10

5 21

8 3 40

9 9 17 20

OBSERVED VARIABLES

age education cognition brain

SAMPLE SIZE

100

10

5 21

8 3 40

9 9 17 20

OBSERVED VARIABLES

age education cognition brain

SAMPLE SIZE

100

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