Ferreira, Sandra S.Ferreira, Sandra A. D.Nunes, CéliaMexia, João T.2020-02-072020-02-072010http://hdl.handle.net/10400.6/9126A 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.engNormal orthogonal mixed modelsSegregated mixed modeljournal article10.1080/15598608.2010.10411983