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Hi Steve, yes it does. And ztop gives you the uncorrected p-value for a given z-value, right? However, Armins quest is asking how to convert, for example, the maximal z-value of a feat analysis with maximum height (i.e. voxel) thresholding into the corresponding maximal corrected p-value. (BTW, ztop [enter] returns: ztop <p> [-2] but shouldn't it read: ztop <z> [-2]?). Cheers- Andreas ________________________________ Von: FSL - FMRIB's Software Library im Auftrag von Stephen Smith Gesendet: Mo 17.10.2005 16:28 An: [log in to unmask] Betreff: Re: [FSL] AW: [FSL] AW: [FSL] ztop 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