one sided or two sided testing

[Michael Wibral]

Dear Emanual,

just a comment on the posts below. 'Prior' knowledge should come from independent data - e.g. collected in a different experiment or from another finding in the literature. It's best if you find some prior knowledge that you can *CITE* - otherwise it'll typically get pretty difficult to publish your one-sided test. I guess you knew this already (so please do not feel insulted by this post), just wanted to save you the trouble with reviewers in the very unlikely event that you didn't. 

Good luck for your study,
Michael

-----Ursprüngliche Nachricht-----
Von: "Eric Maris" <e.maris at DONDERS.RU.NL>
Gesendet: Oct 8, 2010 4:14:43 PM
An: FIELDTRIP at NIC.SURFNET.NL
Betreff: Re: [FIELDTRIP] one sided or two sided testing

>Dear Emanuel,
>
>
>> If you have prior knowledge that the ERP is to be expected to be lower
>> in one
>> group as compared to the other group of subjects is it then allowed to
>> only
>> test the positive T-sum clusters (alpha 0.05) and neglect the negative
>> clusters?
>
>Yes, this is allowed. Such a procedure controls the false alarm rate at
>0.05.
>
>
>Best,
>
>Eric Maris
>
>
>
>> 
>> Thank you in advance,
>> Best, Emanuel
>> 
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You are receiving this message because you are subscribed to
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between  users of the FieldTrip  toolbox, to share experiences
and to discuss  new ideas for MEG and EEG analysis.
See also http://listserv.surfnet.nl/archives/fieldtrip.html
and http://www.ru.nl/neuroimaging/fieldtrip.
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