While correlation isn't causation, it is certainly evidence for causation.
Plus, in many cases, careful analysis alone can reveal the presence (or absence) of causation with great certainty.
Plus, in many cases, careful analysis alone can reveal the presence (or absence) of causation with great certainty.
0: I know there are some exceptions, but they seem rare. http://stats.stackexchange.com/questions/26300/does-causatio...
He is simply stating that correlation can indicate a need to look deeper into the data, which is IMO true.
I think people get confused because there can be evidence for things that aren't true.