I am evaluating the effect of different multi-echo (ME) combination methods on the spatial maps and time-series of resting-state networks (after ICA). I am stuck with the statistical approach of determining whether the difference between the correlation of time-series of different combination methods is significant on a group level. As an example, I have the time-series from the Default Mode Network (DMN) from one subject after ME combination A and calculate the Pearson correlation with the time-series of the DMN of the same subject after ME combination B. This gives me a single correlation value and a single p-value. However, how do I calculate the group average statistics? So I would like to get a single p-value for the correlation of the DMN between combination method A and B for the whole group of subjects. I hope this is clear.
Could anybody help me?
Thanks in advance,