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Example 27
E From the menus, choose View > Options.
E In the Options dialog box, click the Prior tab.
E Select Admissibility test. (A check mark will appear next to it.)
Selecting
Admissibility test sets the prior density to 0 for parameter values that result in
a model where any covariance matrix fails to be positive definite. In particular, the
prior density is set to 0 for non-positive variances.
Amos also provides a stability test option that works much like the admissibility test
option. Selecting
Stability test sets the prior density to 0 for parameter values that result
in an unstable system of linear equations.
As soon as you select
Admissibility test, the MCMC sampling starts all over,
discarding any previously accumulated samples. After a short time, the results should
look something like this: