Author： Solaro Nadia
Publisher： Springer Publishing Company
ISSN： 1618-2510
Source： Statistical Methods and Applications, Vol.16, Iss.1, 2007-06, pp. : 51-67
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Abstract
In this paper we examine maximum likelihood estimation procedures in multilevel models for two level nesting structures. Usually, for fixed effects and variance components estimation, level-one error terms and random effects are assumed to be normally distributed. Nevertheless, in some circumstances this assumption might not be realistic, especially as concerns random effects. Thus we assume for random effects the family of multivariate exponential power distributions (MEP); subsequently, by means of Monte Carlo simulation procedures, we study robustness of maximum likelihood estimators under normal assumption when, actually, random effects are MEP distributed.
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