Hi again
is there a reason to demean data for tbss when having more than one covariate? ( my design includes one group and  2 differnt test scores)
if so should i just choose the - D option in rendomise or demean the data myself?
thanks
reut


From: Gwenaëlle DOUAUD <[log in to unmask]>
To: [log in to unmask]
Sent: Wednesday, August 19, 2009 9:27:49 PM
Subject: Re: [FSL] tbss again

Hi Reut,

so you should have 2 columns in your design..mat and two contrasts in your design.con corresponding to the two questions, right? If you have set up these two files correctly, then you should have two types of outputs from randomise:

corresponding to the first covariate:
blah_tstat1
blah_p_tstat1
blah_***_corrp_tstat1 (depending on the type of correction you went for)

*and*

corresponding to the second covariate:
blah_tstat2
blah_p_tstat2
blah_***_corrp_tstat2

Cheers,
Gwenaelle

--- En date de : Mer 19.8.09, zvreut hlvgrt <[log in to unmask]> a écrit :

> De: zvreut hlvgrt <[log in to unmask]>
> Objet: Re: [FSL] tbss again
> À: [log in to unmask]
> Date: Mercredi 19 Août 2009, 19h18
> Hi
> I want to correlate the FA maps with tow
> different test scores,(I guess that means 2 covariates)
> however the result  map indicates only one result
> in the region found to be correlated to the tests(one color)
> and I don't know which  of the tests
> correlate with the FA,
> Hope that was a better explanation
> thanks
> Reut
>
>
>
> From:
> Steve Smith <[log in to unmask]>
> To:
> [log in to unmask]
> Sent:
> Wednesday, August 19, 2009 9:49:24 AM
> Subject: Re:
> [FSL] tbss again
>
> Hi,
>
> Not quite sure what you're saying here - are you saying
> that you have two covariates, and the resulting two stats
> maps have some (spatial) overlap between them?
>
> Cheers.
>
>
> On 18 Aug 2009, at 09:38, Reut Granot Halevy wrote:
>
> > Hi again
> > I wrote a mail i'm not sure was sent so here it is
> again and if it was sent twice
> > I appologize...
> > thanks for your quick response
> > I another tbss question
> > I have more than one event to correlate the single
> group with and yet the
> > map doesnt separate between them so i don't know
> which event
>  correlated
> > with what. is there a  way to separate the events
> (maybe in the design) so I
> > can tell which event correlated with the regions
> found?
> >
>
>
> ---------------------------------------------------------------------------
> Stephen M. Smith, Professor of Biomedical Engineering
> Associate Director,  Oxford University FMRIB Centre
>
> FMRIB, JR Hospital, Headington, Oxford  OX3 9DU, UK
> +44 (0) 1865 222726  (fax 222717)
> [log in to unmask]
>  http://www.fmrib.ox.ac.uk/~steve
> ---------------------------------------------------------------------------
>
>
>
>