[FieldTrip] Why the general use of parametric test as observed test statistic for permutation cluster tests?
pgoodin at swin.edu.au
Thu Apr 16 00:23:25 CEST 2015
You recall correctly indeed! It was actually that statement that got me thinking about the default use of t-test rather than checking the initial distribution!
BSc (Hons), Ph.D Candidate (submitted).
Brain and Psychological Sciences Research Centre (BPsych)
Hawthorn, Vic, 3122
Monash Alfred Psychiatry Research Centre (MAPrc)
Level 4, 607 St Kilda Road,
From: fieldtrip-bounces at science.ru.nl [fieldtrip-bounces at science.ru.nl] on behalf of Stephen Politzer-Ahles [spa268 at nyu.edu]
Sent: Thursday, 16 April 2015 2:17 AM
To: fieldtrip at science.ru.nl
Subject: Re: [FieldTrip] Why the general use of parametric test as observed test statistic for permutation cluster tests?
As far as I know this is just a default coded in fieldtrip, but can
easily be replaced (by using your own statfun rather than e.g.
depsamplesF, depsamplesT, etc.). According to Maris & Oostenveld
(2007), the observed statistic used to calculate clusters can be
anything, if I recall correctly.
> Message: 2
> Date: Wed, 15 Apr 2015 00:06:33 +0000
> From: Peter Goodin <pgoodin at swin.edu.au>
> To: "fieldtrip at science.ru.nl" <fieldtrip at science.ru.nl>
> Subject: [FieldTrip] Why the general use of parametric test as
> observed test statistic for permutation cluster tests?
> <A55BBE5A90EFC441A6FE147DF0DFE26E890F9252 at gsp-ex03.ds.swin.edu.au>
> Content-Type: text/plain; charset="us-ascii"
> Hi Fieldtrip list,
> I'm just wondering if someone can explain if there is a reasoning behind the
> general use of a parametric test to calculate the initial step in the
> permutation cluster test and not a non-parametric test (e.g t-test over Mann
> Whitey U)? Is it just due to the assumption of a Gaussian distribution or is
> there something deeper going on?
> Peter Goodin,
> BSc (Hons), Ph.D Candidate (submitted).
> Brain and Psychological Sciences Research Centre (BPsych)
> Swinburne University,
> Hawthorn, Vic, 3122
> Monash Alfred Psychiatry Research Centre (MAPrc)
> Level 4, 607 St Kilda Road,
> Melbourne 3004
New York University, Abu Dhabi
Neuroscience of Language Lab
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