Orthogonalization of regressors in FMRI models
The occurrence of collinearity in fMRI-based GLMs (general linear models) may reduce power or produce unreliable parameter estimates. It is commonly believed that orthogonalizing collinear regressors in the model will solve this problem, and some software packages apply automatic orthogonalization....
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| Veröffentlicht in: | PloS one 2015-04, Vol.10 (4), p.e0126255-e0126255 |
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| creator | Mumford, Jeanette A Poline, Jean-Baptiste Poldrack, Russell A |
| description | The occurrence of collinearity in fMRI-based GLMs (general linear models) may reduce power or produce unreliable parameter estimates. It is commonly believed that orthogonalizing collinear regressors in the model will solve this problem, and some software packages apply automatic orthogonalization. However, the effects of orthogonalization on the interpretation of the resulting parameter estimates is widely unappreciated or misunderstood. Here we discuss the nature and causes of collinearity in fMRI models, with a focus on the appropriate uses of orthogonalization. Special attention is given to how the two popular fMRI data analysis software packages, SPM and FSL, handle orthogonalization, and pitfalls that may be encountered in their usage. Strategies are discussed for reducing collinearity in fMRI designs and addressing their effects when they occur. |
| doi_str_mv | 10.1371/journal.pone.0126255 |
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| subjects | Algorithms Analysis Collinearity Computer programs Data analysis Data processing Functional magnetic resonance imaging Hemodynamics Humans Magnetic resonance imaging Magnetic Resonance Imaging - methods Mathematical models Models, Theoretical Packages Parameter estimation Reaction Time Regression Analysis Software Software packages |
| title | Orthogonalization of regressors in FMRI models |
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