do you generate new connections on your own? and what do you do for all of those ideas for which there is no sense data available by which to judge? i don't dismiss T/F or J/P outright but i think they are very muddled and that the questions that are used to determine them are mood dependent (which has been proved in MBTI test-rest experiments among subjects unfamiliar with MBTI).
what if the evidence is not overwhelming or even completely absent, how do you decide?
when you intuit something you need no sense data at all to "know" it is true. that's my point! regardless of Ni or Ne, intuition is at heart a-logical, and often involves "knowing" something that both logic and sense data all scream are incorrect but which in fact turns to be true (like the fact that the earth's crust is really a very thick fluid). i would say all N's, consciously or not, only use sense data to bolster intuitions they already accept as true--and only because they have been conditioned since childhood to do so by having to live in a world dominated by sensors. for us, sense data that contradicts our intuition is challenged strenuously before we will let it defeat our intuition.
for me, it is as if there are color trails on every bit of information that my mind encounters. even when i want to turn it off, she is weaving those threads into endless patterns, most dissolve into nothing but those that don't, those that form a coherent pattern are overwhelmingly, self-evidently, true to me, such that it would take a considerable amount of counter-evidence to defeat the ideas.
i wasn't trying to insult S's, i hope you were not insulted, if you like i can offer a clue to guessing N's: we tend to be conspiracy theorists =)
neither sensing nor intuiting is infallible, but as an N, dealing with S's can be really annoying and a killjoy when a great idea takes hold of me.