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Example 16
About the Data
We will again use the Olsson (1973) data introduced in Example 9. The sample means,
variances, and covariances from the 108 experimental subjects are in the Microsoft
Excel worksheet Olss_exp in the workbook UserGuide.xls.
The sample means, variances, and covariances from the 105 control subjects are in the
worksheet Olss_cnt.
Both datasets contain the customary unbiased estimates of variances and covariances.
That is, the elements in the covariance matrix were obtained by dividing by ( ).
This also happens to be the default setting used by Amos for reading covariance
matrices. However, for model fitting, the default behavior is to use the maximum
likelihood estimate of the population covariance matrix (obtained by dividing by N) as
the sample covariance matrix. Amos performs the conversion from unbiased estimates
to maximum likelihood estimates automatically.
N 1–