Firstly- did you mean to write casual then causal?
No, I meant it the way I wrote it - 'causal' in both cases.
Secondly, and anyway, the causality is enhanced for the reason below
I agree there is a positive correlation, and I am sure I don't have to wheel out the overused 'correlation does not equal causation' because you obviously know your stuff- but what made the researcher think that it was the fish oil that was having the effect ?
No, I meant it the way I wrote it - 'causal' in both cases.
I agree there is a positive correlation, and I am sure I don't have to wheel out the overused 'correlation does not equal causation' because you obviously know your stuff- but what made the researcher think that it was the fish oil that was having the effect ?