Introduction to Logic

Analogy

Reasoning by analogy is reasoning in which we infer a conclusion based on similarity of two situations, as in the following example.

The flow in a pipe is proportional to its diameter.
Wires are like pipes.
Therefore, the current in a wire is proportional to diameter.
Now try price.

Analogy is distinguished from other forms of reasoning, such as abduction, deduction, and induction.