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- Nesting Segregated Mixed ModelsPublication . Ferreira, Sandra S.; Ferreira, Sandra A. D.; Nunes, Célia; Mexia, João T.A mixed model has segregation when its random effects part is segregated as a sub-model. It will be shown that under orthogonality condition, nesting a random effects model inside a segregated mixed model or a segregated mixed model inside a fixed effects model the result will be a segregated mixed model. Unbiased estimators will be obtained for the variance components in both classes of models which are UMVUE, once normality is assumed.