Reasoning by Analogy is an Ni (introverted intuition) process. Unlike a First Principles approach (Ti / introverted thinking), it can't tell you what the truth is, but what it /can/ do is to give you *insight*. It's like applying a camera filter to see things more clearly -- the distortion distills and brings a certain perspective into focus, where as the raw data is grainy and merely obfuscates.