Analogical Argument

Analogical Arguments (or Arguments by Analogy) are a from of Induction where a conclusion is derived from a comparison of similarities between two or more cases.

For example: suppose we have two cases A and B. Upon examination we discover that case A has a set of of properties (p, q, u, r, s, and t). When we examine case B we discover it has a set of properties (p, q, r, and s). We could then draw the conclusion that case B also has property t based on the set of properties shared (i.e., the analog) between the two cases.

The strength of the conclusion will be proportionate to the number and relevance of the analog(s) (as well as the number and relevance of the dissimilarities).

As a form of induction, Analogical Arguments can only give probable conclusions, never certain ones.

Analogical Arguments are common in the fields of Ethics and Law.