A proper analogy should identify the number of respects in which the compared cases, or fact scenarios, resemble one another (let us call these resemblances positive analogies) and the number of respects in which they differ (negative analogies). In analogy, unlike the method of enumeration, the quantity of cases is not significant. Instead, what is important is relevancy—whether the compared facts resemble, or differ from, one another in relevant respects.

Ruggero J. Aldisert, Agatha D. Aldisert, Logic for Lawyers- A Guide …, loc. 343