[Mne_analysis] Comparison of brain responses under three different conditions?

[Maria Hakonen]

Hi Denis,

Should I use two-way ANOVA if I also want to compare hemispheres, i.e. have
a 2*3 (hemisphere*session) ANOVA table?
I would need to do group level analysis.

-Maria

2014-12-21 12:38 GMT+02:00 Denis-Alexander Engemann <
denis.engemann at gmail.com>:

> Hi Maria,
>
> 2014-12-21 10:18 GMT+01:00 Maria Hakonen <maria.hakonen at gmail.com>:
>
>> Hi all,
>>
>> I would need to find the time intervals where there are statistically
>> significant differences between MEG responses measured under three
>> different conditions.  I study the responses by comparing the mean values
>> in steps of 200 ms between the range of 400-2400 ms. I would like to do
>> this for responses from several brain areas. What could be the best way to
>> compare the mean values of the tree responses?
>>
>>
> Single subject or group level?
> For single subject a standard F-test would be appropriate. For groups a
> oneway repeated measures ANOVA, if I understand your design correctly
> (simply 3 different conditions).
>
>
>> I have planned to try f_twoway_rm in a loop. However, when rmANOVA is
>> used, sphericity test is needed, and if the assumption of sphericity is
>> violated, p values need to be corrected. Is there any function for this in
>> Python (e.g. Mauchly's sphericity test and Greenhouse-Geisser test)?
>>
>>
> Note that this only needed if you have more than 2 factors with more than
> two levels. Currently this is not implemented in our stats code. The other
> questions is why you need a 2-way test for 3 conditions. I probably did not
> fully understand your design.
>
> Denis
>
>
>> Many thanks already in advance!
>>
>> Regards,
>> Maria
>>
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