[FieldTrip] testing if power is significantly different from zero

[Lam, Nietzsche]

Hi Hweeling,

I think the approach is similar to testing two different conditions. I have a suggestion below, but I think some people would argue that this is not a good way to do the test.

 You can keep the design matrix the same as comparing two conditions, but for the "zero" condition, you will turn this all into zeros. 
dat1.powspctrm = %power from your condition of interest
dat2 = dat1      % your "zero" condition"
dat2.powspctrm(:) = 0; % making the data structure identical to condition of interest but everything is zero.
Then call your statistics function as before.

Perhaps someone else can give you more detail on this.

Nietzsche

----- Original Message -----
> From: "Hwee Ling Lee" <hweeling.lee at gmail.com>
> To: "FieldTrip discussion list" <fieldtrip at science.ru.nl>
> Sent: Thursday, 17 July, 2014 1:26:59 PM
> Subject: [FieldTrip] testing if power is significantly different from zero
> Hi all,
> 
> 
> I have a naive question regarding cluster statistics in fieldtrip.
> 
> 
> Is it possible to run a statistical analysis to test if power is
> significantly different from zero? If so, how do I build the design
> matrix for this case?
> 
> 
> Thanks.
> 
> 
> Cheers,
> Hweeling
> 
> 
> _______________________________________________
> fieldtrip mailing list
> fieldtrip at donders.ru.nl
> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip

-- 
Nietzsche H.L. Lam, MSc 
PhD Candidate 

Max Planck Institute for Psycholinguistics 
Wundtlaan 1, 6525 XD Nijmegen, The Netherlands 

Donders Institute for Brain, Cognition and Behaviour, 
Centre for Cognitive Neuroimaging, 
Kapittelweg 29, 6525EN Nijmegen, The Netherlands 

n.lam at fcdonders.ru.nl 
+31-24-3668219 


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