Hi - actually, I think that the latest version of FSL has both ztop and
ptoz in it.
Cheers.
On Sat, 15 Oct 2005, Andreas Bartsch wrote:
> Hi Armin,
>
> FEAT actually uses ptoz to find the z-value corresponding to a corrected p (i.e. by using the number of resels in the -g option input for maximum height thresholding).
> However, ptoz is somewhat limited by the decimal places and I am not sure about the reverse, i.e. how to convert a single particular z-value to a >>corrected<< p-value. Maybe, Steve, Mark or Christian will jump in.
> Cheers-
> Andreas
>
> ________________________________
>
> Von: FSL - FMRIB's Software Library im Auftrag von Armin Biller
> Gesendet: Di 11.10.2005 12:16
> An: [log in to unmask]
> Betreff: [FSL] AW: [FSL] ztop
>
>
>
> Hi,
>
> sill I got stuck to that matter, which is not clear to me yet: Having a single z-value (i.e. the maximum z of a higher level FEAT analysis, thresholded at maximum height/voxel level) I'm searching for a way to yield the corrected p-value corresponding to that particular z-value.
>
> Sorry for having posted an imprecise question & thanks for considering this one!
>
> Ciao,
> Armin
>
> -----Ursprüngliche Nachricht-----
> Von: FSL - FMRIB's Software Library [mailto:[log in to unmask]] Im Auftrag von Stephen Smith
> Gesendet: Dienstag, 27. September 2005 14:24
> An: [log in to unmask]
> Betreff: Re: [FSL] ztop
>
> sorry - you'll need to go via ttologp as ztop is for converting single numbers, not images! but if you only have z and not t you can just create a vars image with all 1s in - call the z image the cope/CBs image and set the DOF very high.....
>
> Cheers.
>
>
> On Tue, 27 Sep 2005, Armin Biller wrote:
>
> > Hello,
> >
> > clinging to my previous question I wondered whether it's feasible to
> > use ztop as well? Thanks a lot again!
> >
> > Ciao,
> > Armin
> >
> >
> >
> > Hi - yes, you can use ttologp for this (and avwmaths if you want to
> > undo
> >
> > the log).
> >
> > Cheers.
> >
> >
> > On Mon, 26 Sep 2005, Armin Biller wrote:
> >
> > > Hi there,
> > >
> > > how do I transform higher z values of higher level analysis into p
> > > values? Any suggestions are very welcome! Thanks a lot in advance!
> > >
> > > Ciao,
> > > Armin
> > >
> >
> >
>
> --
> Stephen M. Smith DPhil
> Associate Director, FMRIB and Analysis Research Coordinator
>
> Oxford University Centre for Functional MRI of the Brain John Radcliffe Hospital, Headington, Oxford OX3 9DU, UK
> +44 (0) 1865 222726 (fax 222717)
>
> [log in to unmask] http://www.fmrib.ox.ac.uk/~steve
>
--
Stephen M. Smith DPhil
Associate Director, FMRIB and Analysis Research Coordinator
Oxford University Centre for Functional MRI of the Brain
John Radcliffe Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
[log in to unmask] http://www.fmrib.ox.ac.uk/~steve
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