Re: [Erppcatoolkit-support] different average conditions per participant

[Joseph D. <jd...@ma...>]

I’m going to assume that you are using a file format like Neuroscan .AVG where each condition of each subject is a separate file.  If so, use the Single File option of the Read function to import them (see documentation).  It’ll form a single file in which each subject and each condition is separate but are all held in a single file for convenience sake.

Cheers!

Joe


On Dec 14, 2013, at 4:56 AM, Maria Serena Panasiti <m.s...@gm...> wrote:

> Dear All,
> 
> I have just downloaded the toolkit to perform PCA on my averaged data. I am struggling to understand how I can keep my experimental conditions separeted when I read my data on the toolkit.
> 
> I have two experimental conditions for each subject. I glued all of the averages together in the edit window (append function); I gave the same subject name to the two experimental conditions averages and assigned them a weight of :
> 
> weight   name
> 1            sub001   (This would be: AVg condtion1 subject1)
> 1            sub001   (This would be: AVg condtion2 subject1)
> 1            sub002    (This would be: AVg condtion1 subject2)
> 1            sub002   (This would be: AVg condtion2 subject2)
> 1            sub003   (This would be: AVg condtion1 subject3)
> 1            sub003   (This would be: AVg condtion2 subject3)
> 
> 
> 
> When I run the PCA, the toolkit treats each raw as a single participant (in the command window it would count up to six in this case)
> So I was wondering if this was the right way to feed the program with different averages per conditions.
> 
> As I understood PCA I should need to keep conditions separated but please tell me if I am wrong.
> 
> Any help would be very much appreciated.
> 
> Best wishes,
> 
> Serena
> 
> 
> 
> -- 
> Maria Serena Panasiti, Ph.D
> 
> Cognitive Social and Affective Neuroscience Lab
> Department of Psychology.
> University of Rome "La Sapienza".
> Via dei Marsi 78 - 00185 - Roma.
> Phone: (+39) 06-49917635. Fax: (+39) 06-49917635
> 
> School of Psychology & Clinical Language Sciences
> University of Reading 
> Reading, United Kingdom 
> 
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--------------------------------------------------------------------------------

Joseph Dien,
Senior Research Scientist
Maryland Neuroimaging Center
University of Maryland 

E-mail: jd...@ma...
Phone: 202-297-8117
http://joedien.com