Dear David,
As the Z-values correspond to the p-values, it's actually the p-value that's
[near] zero, in turn depending on the T statistic. Hence, for the Z, an Inf
results. For reporting in a manuscript, you could replace the Inf by a ">
[max on your colourbar|some other Z-score >7 e.g.]".
Hope this helps!
Helmut
----- Original Message -----
From: "David Carmichael" <[log in to unmask]>
Sent: Friday, October 26, 2007 4:55 PM
Subject: inf values for z-scores at the voxel level
> Dear All,
>
> When reporting the voxel level Z statistic values of 'Inf' are reported
> in the graphical display for some positions.
>
> While comfortable with reasoning that this is due to a very significant
> value (so X-mean(X) is a significant value and sd is small) I don't
> understand why you get an Inf rather than simply a large Z or what (if
> any) is the cut-off for reporting Inf?
>
> Thanks
> David
>
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