Quote:
Originally Posted by TechTransfer
it is possible that i'm guilty of post hoc, propter hoc on this, but I don't think so. the trend goes steadily up for twenty years, then very suddenly down for ten, then levels off. Sharp peaks in data don't just happen.
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There's a reason for everything.
But the reasons aren't always observable and attributable to the obvious. You have to control for other factors.