SPM craftsmen,
Excerpts from SPM-help#: 3-Feb-100 Re: Fw: comparision bet... by K Friston
> The only difference between SPM96
> and SPM99 (in terms of estimtation and inference) is that the spatial
> smoothness estimator has been upgraded. This upgrade accommodates
> non-stationary spatial correlations among the errors when correcting
> for the search volume using tests based on peak height (but not on
> those based on spatial extent, at this stage). This advance (due to
> Keith Worsley) allows one to be more confident about corrected
> inferences in situations where the smoothness may change from region to
> region (e.g. VBM).
Is there a reference for this improved smoothness estimator?
-Tom
-- Thomas Nichols -------------------- Department of Statistics
http://www.stat.cmu.edu/~nicholst Carnegie Mellon University
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-------------------------------------- Pittsburgh, PA 15213
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