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Simulation studies comparing fixed effect and mixed models in data sets with multiple measurements in individual sampling units

Citation

West, PW and Ratkowsky, DA, Simulation studies comparing fixed effect and mixed models in data sets with multiple measurements in individual sampling units, Journal of Statistical Computation and Simulation pp. 1-20. ISSN 0094-9655 (2021) [Refereed Article]


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DOI: doi:10.1080/00949655.2021.1931212

Abstract

Use of mixed models is advocated almost ubiquitously when regression analysis is applied in data sets that contain multiple measurements in individual sampling units that lead to intercorrelation amongst the residuals. Using two examples, simulation studies were undertaken comparing models that contained fixed effects only with mixed models in which random effects identified the sampling units within the data set. Both approaches resulted in unbiased estimates of the parameters. The choice of a suitable parameterization for the mixed model proved difficult. It was found that use of either an appropriate mixed model or a lesser-known method (‘adjusted ordinary least squares regression’) to fit models with fixed effects only could yield unbiased estimates of the standard errors of the parameter estimates. However, difficulties remain with computational methods in both cases and it cannot be assumed, a priori, that either approach is necessarily superior to the other for any particular data set.

Item Details

Item Type:Refereed Article
Keywords:regression, fixed effects, mixed models, multiple measurements, longitudinal data
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Forestry sciences
Research Field:Forestry sciences not elsewhere classified
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the mathematical sciences
UTAS Author:Ratkowsky, DA (Dr David Ratkowsky)
ID Code:145059
Year Published:2021
Deposited By:TIA - Research Institute
Deposited On:2021-06-29
Last Modified:2021-06-29
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