A Global Estimator Unbiased by Local Changes
نویسندگان
چکیده
منابع مشابه
A global estimator unbiased by local changes.
The global activity is an important confound when analyzing PET data in that its inclusion in the statistical model can substantially reduce error variance and increase sensitivity. However, by defining global activity as the average over all voxels one introduces a bias that is collinear with experimental factors. This leads to an underestimation of true activations and the introduction of art...
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ژورنال
عنوان ژورنال: NeuroImage
سال: 2001
ISSN: 1053-8119
DOI: 10.1006/nimg.2001.0763