[Eeglablist] p and F values, difference wave, mean amplitudes
mmiyakoshi at ucsd.edu
Tue Sep 2 11:51:44 PDT 2014
> I got an "Reference to non-existent field 'erpdata'" error.
Plot all cluster ERPs, press 'ok' to close the edit/plot UI (this updates
the base workspace memory), and try it again.
On Fri, Aug 29, 2014 at 10:09 AM, Deniz Dohmen <deniz.dohmen at live.de> wrote:
> Thanks for the quick reply!
> However, when I tried it I got an "Reference to non-existent field
> 'erpdata'" error.
> Not really sure why, though.
> > Date: Fri, 29 Aug 2014 09:48:48 -0700
> > Subject: Re: [Eeglablist] p and F values, difference wave, mean
> > From: mdschall at ucsd.edu
> > To: deniz.dohmen at live.de
> > CC: eeglablist at sccn.ucsd.edu
> > Hi Deniz,
> > If you are computing T-tests then you don't need an F value, but you'll
> > find your T value the same way through EEGLAB. The only way I know how is
> > through the command line - you can reference this part of the wiki for
> > more information
> > http://sccn.ucsd.edu/wiki/Chapter_08:_Command_line_STUDY_functions
> > plotting stats & receiving results subsection)
> > If you are more comfortable using the graphic interface, set up all your
> > stat testing parameters first in the GUI, then rather than clicking the
> > plot ERPs button, run this command:
> > [stats, df, pvals, surrog]=statcond(STUDY.changrp(n).erpdata) - where n=
> > the numerical index of the channel of interest. You can find the T-values
> > in the variable called stats. Stats has the same number of data points as
> > your ERP variable, which are samples, not time points. So if you want to
> > see the T-value at latency 300 msec, check out the variable
> > STUDY.changrp(n).erptimes. Times are stored in seconds, so look for
> > and note the column number. Go back and type stats(column number), and
> > you'll have the T-value at that time. Do the same for pvals(column
> > to find the corresponding p value at that time point.
> > Hope this helps!
> > best,
> > Matt
> > PhD Candidate, Cognitive Science, UCSD
> > Adjunct Professor, Psychology, Chapman University
> > https://sites.google.com/site/hazmattneurolab/
> > > Dear List,
> > >
> > > I did all the preprocessing of my data, epoched and created a STUDY
> with 4
> > > conditions for 11 subjects (I'm only comparing conditions a vs b and c
> > > d, respectively. Thus, two paired t-tests).
> > > I also get the graphs and a grey shaded area for the significant
> > > latencies. However, I need to get t and p values for my masterthesis.
> > > Really struggling to get those.
> > > Furthermore, I need to get the mean amplitude of the respective
> > > waves for the 350-450ms latency (in order to correlate them with
> > > measure.
> > > Any advice on how to go about this?
> > > I'm under a bit of time pressure and would appreciate any help!
> > >
> > > Cheers,
> > > Deniz
> > >
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Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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