Analogies
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With certainty off the table for inductive arguments, we speak not of validity or invalidity, but rather of strength or weakness. Here are five key factors to consider in evaluating the strength of any analogy.
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Some people “get” analogies easily; others don’t–and the people who “get” them often don’t know where to start in explaining them to the others. So here’s a basic explanation of analogies: why we use them, how they work, and how they sometimes fail.
Logic Lectures 