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2006 Jul 11
2
non positive-definite G matrix in mixed models: bootstrap?
Dear list,
In a mixed model I selected I find a non positive definite random effects
variance-covariance matrix G, where some parameters are estimated close to
zero, and related confidence intervals are incredibly large.
Since simplification of the random portion is not an option, for both
interest in the parameters and significant increase in the model fit, I
would like to collect