There is a difference between 'cause' and 'association'. Consider the example of a correlation between increased ice cream sales and violent crimes.
The ice cream sales (or consumption of ice cream) is not the cause of the increased violent crime rates, though. Both are caused by higher temperatures, and in reality have nothing to do with each other.
You can test associations to see if they are causal fairly easily with two questions.
* Does the presumed cause precede the effect?
* Does removal of a presumed cause lead to a reduction in the risk?
Obviously, if you banned ice cream in the summer, there would still be increased violent crime. There is no causation between the two.
All well and good. My question is am I simply perceiving an association between an increase of nightmares/sick kids/rough nights and the nights that Beloved is gone? Or is there a causation involved?
*sigh*
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