[Eeglablist] Structure of 'erspdata' in between-subject study design

[Makoto Miyakoshi]

Dear Ketherine,

> In the EEGLAB GUI it shows that there are 22 subjects, 1 condition per
subject (so that's my between-subject factor), and 2 'groups' per subject
(the within-subject factor).

You used the label 'group' for the within-subject factor?

> With the study design set to include both independent variables, is it
correct that the final dimension of 'erspdata' is 11? Or should it be 22?

See below.
http://sccn.ucsd.edu/wiki/Chapter_05:_Component_Clustering_Tools
> Clustering algorithms may not work well with measures having more than 10
to 20 dimensions.

I recommend you use numbers so that the total number of dimensions are less
than 20.

Makoto

On Mon, Feb 2, 2015 at 2:46 PM, Katherine R. Naish <naishek at mcmaster.ca>
wrote:

> Hello,
>
> I have a study design with one between-subject and one within-subject
> factor. There are 22 subjects in total, so there are 11 subjects per
> condition for the between-subject factor. In the EEGLAB GUI it shows that
> there are 22 subjects, 1 condition per subject (so that's my
> between-subject factor), and 2 'groups' per subject (the within-subject
> factor).
>
> After precomputing the ERSP values using the GUI, I then use the following
> lines of code to produce/plot them:
>
> STUDY=pop_erspparams(STUDY,'timerange', [starttime endtime] ,'freqrange',
> [lowfreq highfreq]);
>
> [STUDY, erspdata, ersptimes, erspfreqs]=std_erspplot(STUDY, ALLEEG,
> 'channels',...)
>
> With the study design set to include both independent variables, is it
> correct that the final dimension of 'erspdata' is 11? Or should it be 22?
>
> Thanks in advance,
> Katherine
> --
> Katherine R. Naish
> Social Brain, Body, & Action Lab
> Department of Psychology, Neuroscience & Behaviour
> McMaster University
> Hamilton, ON, CA
> (905) 525-9140 ext. 26755
> https://www.researchgate.net/profile/Katherine_Naish
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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