Hi,
If you are really interested in any changes between the 3 different times in all of the 7 different conditions, then you need to have a different parameter for each of the 21 combinations. Normally you would have a number of repeats of each combination, but this is not essential, although you may struggle to have much statistical power if not. You might want to think about whether there are any more direct ways that you can formulate a question of interest, especially whether there is any way to simplify the 7 different conditions.
All the best,
Mark
On 5 Nov 2013, at 19:00, Jie Yu <[log in to unmask]> wrote:
> Dear Expert
>
> I am using a block design task with 7 conditions each repeat 3 times with random order.
>
> And I'd like to see if there is any time x condition interaction. That is, whether neural response under certain condition remain consistent across time.
>
> I am thinking of creating 21 EVs each for one condition at certain time, and perform 7 times F test...which seems not right?
>
> Thanks so much!
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