[FieldTrip] ft_freqstatistics for between subject design

[Beom Jun Min]

Dear Jörn

Thank you for your kind reply.

Now I think I can approach for the better way.
Actually I am a novice, and trying to learn about the MATLAB, and the
fieldtrip. :)
So far, I have processed step by step, and now I will consider the multiple
comparison issue.

Anyway, thank you again.

With regards.





2014-03-19 23:28 GMT+09:00 "Jörn M. Horschig" <jm.horschig at donders.ru.nl>:

> Hi BeomJun Min,
>
>
>
>  I think that each 5 values correspond with the frequency data point.
>>
> yes, that;s correct.
>
>
>
>> Is that script suitable for the test for the significance, especially
>> avgovertime option 'yes'?
>>
> Yes and no. Yes, because you are testing for significance and, depending
> on what hypothesis you have, averaging over time is perfectly fine. Use
> avgovertime if you are looking for an effect independent of time, otherwise
> set it to 'no'. No, because you should pay attention to why selecting this
> time-frequency region. Now it seems that you selected frequency and time
> window based on eyeballing the data. If you have no apriori hypothesis
> about these frequencies and time window, it's a faulty approach to just
> select the region that shows the strongest approach and do a statistical
> test. You should take the whole time-window and whole freuqency spectrum
> (narrowed down as much as apriori hypotheses allow). If this is a real
> effect it is likely that a proper statistical test will show up only around
> that time-frequency.
>
>
>
>> If I change the avgovertime option to 'no', then can I found the p-values
>> for each frequencies(5 values), and each time point(51 values), in total
>> 255 values that could have multiple comparison issue?
>>
> Yes, you have this problem, is there a reason why you are not using the
> cluster-based permutation test (or any other correction for multiple
> comparison which is implemented by setting the cfg.correctm parameter
> accordingly)?
>
>
>
>> And I thought the 'mask' values of 0 indicates 'statistically
>> non-significance'. Is that right?
>>
> Yes, that is correct.
>
> Best,
> Jörn
>
>
>> --
>> BeomJun Min, M.D.
>>
>> Department of Medical System Engineering (DMSE)
>> Gwangju Institute of Science and Technology (GIST)
>> 261 Cheomdan-gwagiro(Oryong-dong), Buk-gu, Gwangju
>> 500-712, Republic of Korea (South)
>> Phone: +82-62-715-3266 / Fax: +82-62-715-3244
>> E-mail: mbj0310 at gmail.com <mailto:mbj0310 at gmail.com>,
>> http://bmssa.gist.ac.kr <http://bmssa.gist.ac.kr/>
>>
>>
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>>
>
>
> --
> Jörn M. Horschig
> PhD Student
> Donders Institute for Brain, Cognition and Behaviour
> Centre for Cognitive Neuroimaging
> Radboud University Nijmegen
> Neuronal Oscillations Group
> FieldTrip Development Team
>
> P.O. Box 9101
> NL-6500 HB Nijmegen
> The Netherlands
>
> Contact:
> E-Mail: jm.horschig at donders.ru.nl
> Tel:    +31-(0)24-36-68493
> Web: http://www.ru.nl/donders
>
> Visiting address:
> Trigon, room 2.30
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> NL-6525 EN Nijmegen
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>
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>



-- 
BeomJun Min, M.D.

Department of Medical System Engineering (DMSE)
Gwangju Institute of Science and Technology (GIST)
261 Cheomdan-gwagiro(Oryong-dong), Buk-gu, Gwangju
500-712, Republic of Korea (South)
Phone: +82-62-715-3266 / Fax: +82-62-715-3244
E-mail: mbj0310 at gmail.com, http://bmssa.gist.ac.kr
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