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Sep 18, 2016

linear mixed model - problem/? with nested random effects

I am using JMP 12 pro for a linear mixed model.  I have two fixed effects and multiple nested random effects.  When I set up the model as I think it should be I get 0 for the covariance parameter estimates for one nested effect. Why is this happening?  I use a similar analysis in another linear mixed model and the same nested random effects doesnt give 0 so I assume I am not doing something right.