[FieldTrip] degrees of freedom

[Roy Cox]

thanks Jim,

looks like that should do the trick.

Roy


On Fri, Jan 24, 2014 at 9:14 AM, Herring, J.D. (Jim) <
j.herring at fcdonders.ru.nl> wrote:

> Hi Roy,
>
>
>
> Fieldtrip allows you to create and use your own functions to calculate
> statistics. What you could also do is adjust the indepsamplesT statistic
> function (fieldtrip/statfun/ft_statfun_indepsamplesT.m) to suite your needs
> (E.g. change the Df in line 89).
>
>
>
> Best,
>
>
>
> Jim
>
>
>
> *From:* fieldtrip-bounces at science.ru.nl [mailto:
> fieldtrip-bounces at science.ru.nl] *On Behalf Of *Roy Cox
> *Sent:* donderdag 23 januari 2014 16:20
> *To:* fieldtrip at science.ru.nl
> *Subject:* [FieldTrip] degrees of freedom
>
>
>
> Hi all,
>
> I'm using ft_timelockstatistics with indepsamplesT to compare spatial
> topographies between two groups (n=15 and n=13). The measure I'm interested
> in has no time dimension, so I basically have one sample per electrode for
> each subject.
>
>
>
> This works fine (I get the effects I hoped for). In order to make the
> statistics 'slightly more valid', however, I need to adjust the degrees of
> freedom. That is, the data I'm comparing between groups has already had a
> covariate taken out. So df has to be df-1.
>
> Doesn't look like Fieldtrip allows you to set this in the cfg struct
> somewhere, so any suggestions where I need to hack?
>
> Thanks,
>
> Roy
>
>
> --
>
> Roy Cox, M.Sc. | Brain & Cognition Group | Department of Psychology |
> University of Amsterdam | Weesperplein 4 | 1018 XA Amsterdam | the
> Netherlands | room 3.21 | phone: +31 20 525 6847 | email: r.cox at uva.nl
>
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>



-- 
Roy Cox, M.Sc. | Brain & Cognition Group | Department of Psychology |
University of Amsterdam | Weesperplein 4 | 1018 XA Amsterdam | the
Netherlands | room 3.21 | phone: +31 20 525 6847 | email: r.cox at uva.nl
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