In an argument by analogy the reasoning is that because things are observably similar in some important respects they are also probably similar in other important respects, though the latter similarity is not directly observed, rather, it is inferred from the former similarity. Notice that the use of the word 'probably' indicates that an argument by analogy might reasonably be considered a kind of inductive argument. When evaluating an analogy, you should consider how closely similar the things being compared are. The tighter the similarity of the observables, and the tighter the similarity inferred, the stronger the argument is.
