[Eeglablist] F and P numerical values in a STUDY

[Arnaud Delorme]

Dear Muhammad,

when you have a n x m design, statcond returns cell array of 3 output for the F value (and the p values as well). The first two are the marginal effect along each dimension and the last one is the interaction effect. 

By comparison if you are using the anova2 function of Matlab, these are the values for the 'Columns', 'Rows'  and 'Interaction'. There is one value per time point and per electrode which explains why you have arrays of size 426x61 for the F and p values.

Hope this helps,

Arno

On Aug 14, 2012, at 8:59 AM, M Abul Hassan wrote:

> Dear eeglab users
> I made a study with three groups and three conditions. I used matlab script (1) to get erp values in a STUDY followed by matlab script (2) to get F and P values.
> 
> (1) [STUDY erpdata erptime] = std_erpplot(STUDY,ALLEEG,'channels',{alllocs.labels});
> (2) [F df pvals]=statcond(erpdata);
> 
> For F and P values:
> I got an array of 1 * 3 from which I extract values. The size of F and P values data for each cell is equal to size of erpdata (426*61), number of electrodes are 61. It is not cleared whether these cells represents groups or conditions because I am getting 1 * 3 rather than 3 * 3 which is expected.
> 
> For df values:
> I got an array of 1 * 3 and each cell size is 1 * 2. The values for cell1 and cell2 are same equal to 2 and 72,  whereas values for cell3 are 4 and 72. I dont know what these values represents and why I am getting cell size of 1 * 2.
> 
> Can somebody give me advice on this.
> 
> Thanks
> Best Regards
> Muhammad Abul Hasan
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