Hi Gwenaelle,
thanks - didn't know that!
Cheers,
Cornelius
Am 24.03.2010 um 12:56 schrieb Gwenaëlle DOUAUD:
> Hi Cornelius and Elena,
>
> PPheights are not taken into account in randomise analyses of TBSS and VBM...
> So Elena, the changes you've made are fine.
>
> Cheers,
> Gwenaelle
>
>
> --- En date de : Mer 24.3.10, Cornelius Werner <[log in to unmask]> a écrit :
>
>> De: Cornelius Werner <[log in to unmask]>
>> Objet: Re: [FSL] Design matrix with covariat age
>> À: [log in to unmask]
>> Date: Mercredi 24 mars 2010, 11h48
>> Hi,
>>
>> you probably need to adjust PPheights (peak-to-peak
>> heights) to "1 1 6", with "6" being the distance between
>> your smallest (-2) and your largest (4) value of the
>> corresponding vector. Although I do not know to what extent
>> this value influences subsequent statistics.
>>
>> Cheers
>> Cornelius
>>
>> Am 24.03.2010 um 11:22 schrieb Elena Miramontes:
>>
>>> Hi,
>>>
>>> I have a further question concerning the design
>> matrix, which I use for the voxelwise statistics in TBSS.
>>> At the moment my design matrix has two EV, the patient
>> group and the control group.
>>> /Num Waves 2
>>> /Num Points 31
>>> /PPheights 1 1
>>> /Matrix
>>> 1 0
>>> 1 0
>>> 1 0
>>> 0 1
>>> 0 1
>>> 0 1
>>> ...
>>>
>>> Now, I want to add the age as a covariate. (I have
>> demeaned the age). How do I have to change the values in
>> /Num Waves, /Num Points and /PPheigts?
>>>
>>> My suggestion is:
>>> /Num Waves 3
>>> /Num Points 31
>>> /PPheights 1 1
>>> /Matrix
>>> 1 0 -2
>>> 1 0 1
>>> 1 0 -1
>>> 0 1 4
>>> 0 1 2
>>> 0 1 1
>>> ...
>>>
>>> Is that right?
>>> I changed the value in /Num Waves corresponding to the
>> numbers of columns. But I didn't changed the value in
>> /PPheights.
>>>
>>> Thank you for your help,
>>> Elena
>>
>
>
>
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