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In statistics, it's important to understand correlation and causation as two different terms, meaning very different things.
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What correlation tells us is just something about the magnitude or the strength and the direction of relationship between two variables.
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So it's just telling us some sort of tendency which exists between two variables.
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So maybe we have positive correlation, in which case two variables tend to move in the same direction.
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Or we have negative correlation, in which case two variables tend to move in opposite directions.
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But what's important to note is that correlation does not imply causation.
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Causation, on the other hand, is telling us not about just that magnitude and direction two variables move in, but it's telling us about how exactly one variable causes another variable.
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So what impact or what effect one variable has on another variable...