From what I understand, you couldn't use both judging functions at the same time. I suppose it's possible to be a Fi dom, start off making a decision in that manner, and then clarify/articulate your thoughts in a Ti manner. Or vice versa. I don't notice when/if people are doing that though.
The only other test I know of that somewhat tests for specific functions (although not in an overt way) is the "MMDI" (click the link that says "long test".. the results at the end will show function placement).
I definitely feel that I have a good Ti, even if it's weaker than my Fi. I use NeTi all the time and the more I read about Ti, the more I think I use it. It's also why I've come to disagree with the standard order of functions. So in short, yes, I don't know if the classic theories allow for this but it's definitely the case for me.
Chimera of Filth
A gruesome beast with dripping flesh
Clings to me as a sick fixture
My throbbing heart it gnawed apart
It stalks and hunts me through mirrors
What do you mean by 'strong' here? I like to think of 'strong' as in how strong an influence that function has on your decision-making. So, someone with exactly 50/50 T/F will have an equal preference to T and F.
Imagine having 2 friends giving you advice. 50/50 means you have a 50% chance of listening to any one of them. 60/40 means 60% probability of listening to the first friend, and so on...
Remember though that preference does not equal to skill. You may have a 50/50 preference for T and F but that doesn't mean you're equally good at 'using' them.
4w5, Fi>Ne>Ti>Si>Ni>Fe>Te>Se, sp > so > sx
appreciates being appreciated, conflicted over conflicts, afraid of being afraid, bad at being bad, predictably unpredictable, consistently inconsistent, remarkably unremarkable...
I may not agree with what you are feeling, but I will defend to death your right to have a good cry over it
The whole problem with the world is that fools & fanatics are always so certain of themselves, and wiser people so full of doubts. ~ Bertrand Russell
though it's kind of weird for INFP/INTP to have high Ti/Fi, because even just looking at their first four functions and discarding the rest of supposed function order:
Fi Ne Si Te (INFP)
Ti Ne Si Fe (INTP)
T and F are so low on each other's respective lists that it would be rather surprising to find it, in the opposite attitude no less, almost as high in preference as their dominant. even if we switched Si for Te/Fe it still is only tertiary, which is far from the dominant. and that's not to say it can't happen, just that it's probably rather unlikely - i would be more willing to bet that someone is mistaking Ti for Fi or vice versa than that they are actually using both Ti and Fi strongly. or perhaps even that they're ENP and having a hard time figuring it out because they have a strong tertiary.
speaking of, T/F confusion is not as weird for ENFP/ENTP, because our function order goes
Ne Fi Te Si (ENFP)
Ne Ti Fe Si (ENTP)
so not only are Fi/Ti not dominant, but Te/Fe are our tertiaries, so it's easier to see how we could develop Ti or Fi which is closer to being balanced with our auxiliary (though again i would check and make sure someone is not really just using Te/Fe and mistaking it for Ti/Fi).
by the same token, of course, it's easier to see an INP being near the boundary in N/S, as opposed to T/F. the dominant function usually is so clear to people that, unless they're simply mistaking it for the complementary same-attitude function, it's unlikely to be nearly a true ambivert on it.
of course, all of this is theoretical. i have no idea if actual statistics support it.
I tend to fall in between NiFe and NiTe, but in most situations, I cannot "use" Te and Fe at the same time. If I am interacting with a close friend of mine, I will end up naturally using Fe more than Te. In a science lab, however, I will end up switching gears to Te mode.
“Thoughts are the shadows of our feelings -- always darker, emptier and simpler.”
― Friedrich Nietzsche