Hi Rick,
thanks for clarifying this, makes sense.
Is there actually a rule of thumb how many volumes need to be left for a reliable seed correlation? What other factors does it depend on? I read often that researchers exclude participants with less that 90 or 80% of data left but for me that would mean that I lose more than half. I have a 10 minutes RS scan leading to 200 volumes. Looking at a seed correlation with PCC as seed, I can see no systematic difference between the correlation patterns of participants with ~200 volumes and those who have only 100 or even less volumes left after censoring - they all look very similar. But maybe this isn't a proof that the correlations of participants with fewer volumes are reliable?
Best,
Janina