Hi Jurgen and Marko,
this is usually symptomatic of having used Unequal Variance when
specifying your model. For a paired t-test you should use Equal Variance.
Best,
Guillaume.
PS: anyway, three subjects??
Marko Wilke wrote:
> Hi Jürgen,
>
>> I tried to do a paired t-test on FA maps from only three subjects. When I
>> used smoothed data the following error occurred:
>>
>> ??? Error using ==> image
>> Error using ==> image
>> Image CData can not be complex
> [...]
>> However, when the data were not smoothed this error did not appear.
>
> Just a wild guess, but when you smooth the data, do you keep the
> original image format (SAME in the extended options)? If this is set to
> another format, this would explain that the error occurs after
> smoothing. CData is involved in plotting and defining color properties,
> so why it occurs, I have no idea.
>
> Hope this helps,
> Marko
--
Guillaume Flandin, PhD
Wellcome Trust Centre for Neuroimaging
University College London
12 Queen Square
London WC1N 3BG
|