[Eeglablist] Fwd: Fwd: SIFT toolbox

Matt Gerhold matt.gerhold at gmail.com
Mon Jul 8 04:27:12 PDT 2019


Aikaterini:

You do need to validate your model(s). Reviewers and examiners will request
validation statistics. This should include:

   - Whiteness of residuals
   - Test for model stability
   - A check if the residuals are Gaussian (optional for some)

This tells us whether the modelling procedure has been successfully applied
to the data. Window length in relation to model order can contribute to
estimation bias, so these parameters have to be chosen carefully. Often,
one has to pre-process cautiously and iterate through a few models in order
to get a good final model that satisfies the criteria.

Rgds,

Matthew



On Mon, Jul 8, 2019 at 12:51 PM AIKATERINI LYMPERIDOU <
med1p1040133 at med.uoc.gr> wrote:

>
> I just noticed that I can compute the connectivity measures
> successfully even my model does not pass the Validation Tests. So if
> you are facing the same problem, just go the next step without
> bothering a lot. The most important things are Model Order selection,
> the selection of the window step and the window length.
>
> Hope you the very best!
>
>
>
> Quoting AIKATERINI LYMPERIDOU <med1p1040133 at med.uoc.gr>:
>
> > Please note that the window for the "Model Validation Results"
> > appears but none of the windows pass the "Residual Whiteness Test"
> > and the graph for the "Whiteness Significance" does not appear.
> >
> > I cannot understand if this is a problem of preprocessing or I am
> > missing something.
> >
> >
> >
> > Quoting AIKATERINI LYMPERIDOU <med1p1040133 at med.uoc.gr>:
> >
> >> Hello to everyone!
> >>
> >> I am using the SIFT toolbox (EEGLAB-compatible toolbox for analysis
> >> and visualization of multivariate causality).
> >>
> >> My data are task-related (button pushed when the subject realize if
> >> he see a figure inside the context of the whole pictue ). I used
> >> filtering (bandpass filter (2:65), hamming window) and
> >> preprocessing and the other steps the group of SIFT recommends for
> >> analysis in their "SIFT_Practicum"
> >> (https://sccn.ucsd.edu/wiki/SIFT) for a sample dataset.
> >>
> >>
> >> Unfortunately, in the step of "Validate Model" I get this error.
> >>
> >> Warning: defaultParallelConfig will be removed in a future release. Use
> >> parallel.defaultClusterProfile instead.
> >> WARNING: The MVAR algorithm 'BSBL L1' depends on BSBL_L1_noise.m,
> >> which cannot be located on the path. This algorithm will not be
> >> available.
> >> Constant detrending each window...
> >> done.
> >> Done.
> >> WARNING: The MVAR algorithm 'BSBL L1' depends on BSBL_L1_noise.m,
> >> which cannot be located on the path. This algorithm will not be
> >> available.
> >> Warning: defaultParallelConfig will be removed in a future release. Use
> >> parallel.defaultClusterProfile instead.
> >> Constant detrending each window...
> >> done.
> >> Done.
> >> Undefined function or variable "f".
> >>
> >> Error in findobjuser (line 45)
> >> h = h(f);
> >> Error in PropertyGrid/FindPropertyGrid (line 409)
> >>            h = findobjuser(@(userdata) userdata.(member) == obj,
> >> '__PropertyGrid__');
> >>
> >> Error in PropertyGrid.OnPropertyChange (line 428)
> >>            self = PropertyGrid.FindPropertyGrid(obj, 'Model');
> >>
> >> Done.
> >>
> >>
> >> Could anyone face the same error as me?
> >> I would really appreciate it if you have any idea why this is happening.
> >>
> >> Thank you,
> >> Katerina
> >>
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