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Some New Methods for the Comparison of Two Linear Regression Models

Liu, Wei, Jamshidian, Mortaza, Zhang, Ying, Bretz, Frank and Han, Xiaoliang (2006) Some New Methods for the Comparison of Two Linear Regression Models J Statistical Planning and Inference

Record type: Article


The frequently used approach to the comparison of two linear regression models is to use the partial F test. It is pointed out in this paper that the partial F test has in fact a naturally associated two-sided simultaneous confidence band, which is much more informative than the test itself. But this confidence band is over the entire range of all the covariates. As regression models are true or of interest often only over a restricted region of the covariates, the part of this confidence band outside this region is therefore useless and to ensure 1 - ? simultaneous coverage probability is therefore wasteful of resources. It is proposed that a narrower and hence more efficient confidence band over a restricted region of the covariates should be used. The critical constant required in the construction of this confidence band can be calculated by Monte Carlo simulation. While this two-sided confidence band is suitable for two-sided comparisons of two linear regression models, a more efficient one-sided confidence band can be constructed in a similar way if one is only interested in assessing whether the mean response of one regression model is higher (or lower) than that of the other in the region. The methodologies are illustrated with two examples.

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Published date: 2006


Local EPrints ID: 17489
PURE UUID: d4d326f4-a8f0-476d-aa8e-2cabfde8cdcb
ORCID for Wei Liu: ORCID iD

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Date deposited: 05 Oct 2005
Last modified: 17 Jul 2017 16:38

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Author: Wei Liu ORCID iD
Author: Mortaza Jamshidian
Author: Ying Zhang
Author: Frank Bretz
Author: Xiaoliang Han

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