[FieldTrip] 8048
Dr. Stephan Frisch
stephan.frisch at uni-ulm.de
Wed Mar 29 12:19:25 CEST 2023
Guten Tag,
Hi,
Ich bin vom 23.03.2023 bis 02.04.2023 nicht im Büro und kann die Emails nur sehr unregelmäßig lesen und beantworten. Die Emails werden auch nicht weitergeleitet.
I am out of the office from 03/23/2023 to 04/022023 and can only read and answer emails very sporadically. The emails are also not being forwarded.
Viele Grüße / Best regards
Stephan Frisch
Am 29.03.2023 um 10:02 schrieb Dr. Stephan Frisch via fieldtrip <fieldtrip at science.ru.nl>:
> Guten Tag,
> Hi,
>
> Ich bin vom 23.03.2023 bis 02.04.2023 nicht im Büro und kann die Emails nur sehr unregelmäßig lesen und beantworten. Die Emails werden auch nicht weitergeleitet.
>
> I am out of the office from 03/23/2023 to 04/022023 and can only read and answer emails very sporadically. The emails are also not being forwarded.
>
> Viele Grüße / Best regards
> Stephan Frisch
>
>
> Am 28.03.2023 um 16:31 schrieb Dr. Stephan Frisch via fieldtrip <fieldtrip at science.ru.nl>:
>
> Guten Tag,
> Hi,
>
> Ich bin vom 23.03.2023 bis 02.04.2023 nicht im Büro und kann die Emails nur sehr unregelmäßig lesen und beantworten. Die Emails werden auch nicht weitergeleitet.
>
> I am out of the office from 03/23/2023 to 04/022023 and can only read and answer emails very sporadically. The emails are also not being forwarded.
>
> Viele Grüße / Best regards
> Stephan Frisch
>
>
> Am 28.03.2023 um 15:45 schrieb Dr. Stephan Frisch via fieldtrip <fieldtrip at science.ru.nl>:
>
> Guten Tag,
> Hi,
>
> Ich bin vom 23.03.2023 bis 02.04.2023 nicht im Büro und kann die Emails nur sehr unregelmäßig lesen und beantworten. Die Emails werden auch nicht weitergeleitet.
>
> I am out of the office from 03/23/2023 to 04/022023 and can only read and answer emails very sporadically. The emails are also not being forwarded.
>
> Viele Grüße / Best regards
> Stephan Frisch
>
>
> Am 28.03.2023 um 14:42 schrieb philip Joadavi via fieldtrip <fieldtrip at science.ru.nl>:
>
>
> Dear Dr.Maris/ Schoffelen /Oostenveld
>
> I posted a question on the mailing list about 2x2 ANOVA at the source level (please see below my email).
> It's been 2 weeks and I have not found if there is anything wrong with my code. I would really really appreciate it if you could have a look at my code and let me know if I have done all the steps correctly.
>
> Thanks a lot,
> Philip
>
>
>
> ---------- Forwarded message ---------
> From: philip Joadavi <p.joadavi at gmail.com>
> Date: Wed, Mar 15, 2023 at 5:14 PM
> Subject: 2x2 ANOVA at source level using cluster based permutation
> To: FieldTrip discussion list <fieldtrip at science.ru.nl>
>
>
> Dear all,
>
> I would like to run ANOVA to test the main and interaction effects on my beamforming results. (I used DISC beamformer)
> I've already looked at the FAQ on the FieldTrip website and also the questions in the mailing list.
>
> To check if I have done the steps correctly, I have also done the 2x2 ANOVA using SPM and I got significant results, but without FWE/FDR correction for multiple comparisons at the voxel level.
>
> When I apply the steps described in the FieldTrip and also the mailing list (for cluster-based permutation) I could not get any significant clusters. This is surprising for me because I get always nicer results from permutation tests than I do not get from SPM.
>
> I think I'm doing something wrong and I would appreciate any help.
>
> So, as far as I understood, I can not use F statistics for 2x2 ANOVA, and therefore I used dependent sample T statistics for within-subject design as explained by Eric in the mailing list.
>
> here is my code :
> So, I have 2 conditions A and B, each with 2 levels (I & II).
> For the averages, I used ft_ grandaverage for 2 conditions/levels, and I got a matrix of pow = [number of subjects x number of voxels] = [12x 411477]
>
> Here is the code:
>
> my data is arranged such that the columns are the conditions (A/B) and the rows are the levels (I/II).
>
> % Main effect of levels (I/II)
> I = ft_sourcegrandaverage([],GA{1,1:2});
> II = ft_sourcegrandaverage([],GA{2,1:2});
>
> % Main effect of conditions (A/B)
> A = ft_sourcegrandaverage([],GA{1:2,1});
> B = ft_sourcegrandaverage([],GA{1:2,2});
>
> % Interaction effect
> cfg = [];
> cfg.operation = 'subtract';
> cfg.parameter = 'pow';
>
> INA = ft_math(cfg, GA{1,1}, GA{2,1}); % I - II (A)
> INB = ft_math(cfg, GA{1,2}, GA{2,2}); % I - II (B)
>
>
> %% prepare the hypothesis testing
> cfg = [];
> cfg.dim = GA{1}.dim;
> cfg.method = 'montecarlo';
> cfg.correctm = 'cluster';
> cfg.spmversion = 'spm12';
> cfg.parameter = 'pow';
> cfg.numrandomization = 'all';
> cfg.correcttail = 'alpha';
>
>
> cfg.statistic = 'depsamplesT';
> cfg.alpha = 0.05/2; % two tails
> cfg.clusteralpha = 0.01;
> cfg.tail = 0; % I also tried 1 for one tail
> cfg.clustertail = cfg.tail;
> cfg.uvar = 1; % subject
> cfg.ivar = 2; % conditions
> cfg.design = [repmat(1:numel(subjects),1,2); repelem([1 2],numel(subjects))];
>
>
>
> stat{1} = ft_sourcestatistics(cfg,I,II); % main effect (I/II)
>
> stat{2} = ft_sourcestatistics(cfg,A,B); % main effect (A/B)
>
> stat{3} = ft_sourcestatistics(cfg,INA,INB); % Interaction
>
>
> Side note: I also tried the one-tail option, but the results were not significant eighter.
>
>
>
>
>
>
> I would appreciate any help!
> Best,
> Philip
>
>
> _______________________________________________
> fieldtrip mailing list
> https://mailman.science.ru.nl/mailman/listinfo/fieldtrip
> https://urldefense.com/v3/__https://doi.org/10.1371/journal.pcbi.1002202__;!!HJOPV4FYYWzcc1jazlU!4hcOuoiT-_gobHHKLgcBXJUd3XfBgrphJkfyC1RHkCtkbnXXsVOCZ1bjVodukV0XBoEBt3UH2Mhwj3Dfp2bJbmm_BpTSNeWNMA$
> _______________________________________________
> fieldtrip mailing list
> https://mailman.science.ru.nl/mailman/listinfo/fieldtrip
> https://urldefense.com/v3/__https://doi.org/10.1371/journal.pcbi.1002202__;!!HJOPV4FYYWzcc1jazlU!8oIwuoHxW5acGfBKbLedrV-jlbwuD_RHAipLup8OVPl8gSs5IB1fmhXItAguSCsWh5ijotAh6T_aTGwDrfzJpvswE5QwJrak4A$
> _______________________________________________
> fieldtrip mailing list
> https://mailman.science.ru.nl/mailman/listinfo/fieldtrip
> https://urldefense.com/v3/__https://doi.org/10.1371/journal.pcbi.1002202__;!!HJOPV4FYYWzcc1jazlU!6Ow3HFW49p_bW1yZUXa_xwu_hRQnLVhek2_j7xG1vx5yRWY_pA7B68dgvARqGq7N_rwmNnVVDc_H1nfvRDSqq9yb-vM6UHHWCQ$
> _______________________________________________
> fieldtrip mailing list
> https://mailman.science.ru.nl/mailman/listinfo/fieldtrip
> https://urldefense.com/v3/__https://doi.org/10.1371/journal.pcbi.1002202__;!!HJOPV4FYYWzcc1jazlU!7dM2NuSrpmHGgR0k32jxxOtui_leWDmURkOzzBSvSFToPJ5DYL7VbwDnu8oQV7xzIEvLsr5l5hJG8iSUbbvOlJD_XuKytuUhyw$
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: text/enriched
Size: 6857 bytes
Desc: not available
URL: <http://mailman.science.ru.nl/pipermail/fieldtrip/attachments/20230329/ab773af7/attachment.bin>
More information about the fieldtrip
mailing list