Dear Karl,
Thanks again for your reply - but more questions Im afraid:
Is the T statistic map scaled then? ie what does the value of 256 in
Analyze correspond to in the T map? The maximum T in the analysis?
Best wishes,
Clare.
________________________________________________________________________
Clare Mackay
Magnetic Resonance and Image Analysis Research Centre,(MARIARC)
University of Liverpool, PO Box 147, Liverpool, L69 3BX. UK.
tel: 0151 794 5629 fax: 0151 794 5635
_________________________________________________________________________
On Fri, 1 Oct 1999, Karl Friston wrote:
>Dear Clare,
>
>> The next question is: When you output the results using 'write
>> filtered', is the maximum value always 8.21, or is it scaled depending
>> upon the maximum Z value of your data set?
>
>In SPM99 the values written are actually the statistic (e.g. T or F),
>not the Z equivalent score. The Z equivalent Ze is computed such that
>
>p(t > T) = p(Z > Ze)
>
>and only appears in the tables for reporting maxima in papers. There
>is no upper limit on these statistics.
>
>With best wishes - Karl
>
>
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|