[FieldTrip] calculating correlation

[Ingrid Nieuwenhuis]

Hi JM!
haha, sounds good, I'll contact you :)
Cheers,
Ingrid

On 7/1/2012 11:53 PM, jan-mathijs schoffelen wrote:
> Hi Ingrid,
>
> This calls for a statfun_corr or even a statfun_glm! It so happens 
> that I have some of these sitting on my hard drive. As you know I am 
> fond of beer, chocolate and co-authorships, so I am sure we can strike 
> a deal. I have not yet had the opportunity to contribute these 
> statfuns to FieldTrip, but now I sense a win-win-win situation: win 1 
> is for me (beer/chocolate/co-authorships/etc), win 2 is for you (you 
> can compute your statistic of interest) and win 3 for the community 
> (where you test the code, write documentation on the wiki etcetc). How 
> does that sound for a plan?
>
> Cheers,
>
> JM
>
> On Jul 1, 2012, at 10:15 PM, Ingrid Nieuwenhuis wrote:
>
>> Hi FTers,
>>
>> I'd like to do two sorts of correlation calculations, and was  
>> wondering if there's any easy way to do this within FieldTrip.
>>
>> 1) I'd like to calculate the correlation between performance over 
>> trials and power within a specific frequency over trials. So I have 
>> the performance measure per trial, and my chan*freq measure after 
>> freqanalysis. So for each channel I have a series of power values 
>> (trials) and I have a series of performance measures (per trial), and 
>> now like to know (first within, and then over subjects) which 
>> channel's frequency power follows (correlates) with the performance.
>>
>> From the walkthrough 
>> <http://fieldtrip.fcdonders.nl/walkthrough#correlation> I understand 
>> I can give in these performance measures through the design 
>> (cfg.design=[0.10.20.30.40.50.40.30.10.2];cfg.ivar=1;), but which 
>> method to use for ft_freqstatistics? I don't see statistics = 
>> 'correlation' or 'pearson' or 'spearman' in method = 'analytic. Also 
>> how to make the design to correlate over trials?
>>
>> 2) I'd like to calculate the correlation between the score on 
>> repeated questionnaire over participants with power within a 
>> frequency. So I have several power values per participant for each 
>> channel, and the repeated scores on the questionnaire for each 
>> participant. And now I'd like to calculate a value per channel 
>> reflecting the correlation over the repeats of the questionnaire and 
>> over participants.
>>
>> Any idea on FieldTrip settings? Both in general, is there a 
>> correlation statistics implemented, and more specifically for my 
>> question, how would I make the appropriate designs?
>>
>> Thanks so much!
>> Ingrid
>> -- 
>> Ingrid Nieuwenhuis PhD
>> Postdoctoral Fellow
>> Sleep and Neuroimaging Laboratory
>> Department of Psychology
>> University of California, Berkeley
>> California 94720-1650
>> Tolman Hall, room 5305
>> _______________________________________________
>> fieldtrip mailing list
>> fieldtrip at donders.ru.nl <mailto:fieldtrip at donders.ru.nl>
>> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
>
> Jan-Mathijs Schoffelen, MD PhD
>
> Donders Institute for Brain, Cognition and Behaviour,
> Centre for Cognitive Neuroimaging,
> Radboud University Nijmegen, The Netherlands
>
> Max Planck Institute for Psycholinguistics,
> Nijmegen, The Netherlands
>
> J.Schoffelen at donders.ru.nl <mailto:J.Schoffelen at donders.ru.nl>
> Telephone: +31-24-3614793
>
>
>
> _______________________________________________
> fieldtrip mailing list
> fieldtrip at donders.ru.nl
> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip

-- 
Ingrid Nieuwenhuis PhD
Postdoctoral Fellow
Sleep and Neuroimaging Laboratory
Department of Psychology
University of California, Berkeley
California 94720-1650
Tolman Hall, room 5305



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