I don't really think that test is valid. The descriptions were too simplistic. For instance, anyone who was reasonably curious and intelligent could get a high Ti score, anyone who was organized/businesslike could get a high Te score, anyone who was well-versed in the social graces could get a high Fe score, etc. So this doesn't tell you what type you are likely to be.
Just for the heck of it I retook it, here's the results:
Cognitive Process Level of Development (Preference, Skill and Frequency of Use)
extraverted Sensing (Se) ****************** (18.3)
limited use
introverted Sensing (Si) ************** (14.2)
unused
extraverted Intuiting (Ne) *********************************** (35.7)
good use
introverted Intuiting (Ni) ************************************* (37.4)
excellent use
extraverted Thinking (Te) ******************************************* (43.6)
excellent use
introverted Thinking (Ti) *********************************************** (47.7)
excellent use
extraverted Feeling (Fe) *************** (15)
unused
introverted Feeling (Fi) **************************** (28.3)
average use
So more INTP than anything -- but certainly not a very conclusive result. I'm a little surprised that the T scored that much higher than N overall. I have never convinced myself that I was an E for longer than a few weeks, but I suppose simply being NT could explain my lack of social involvement if that
was the case. Most likely I was just in a logical mood when answering the questions, and use both forms fairly often.
What confuses me is that IxTP's should be confused between ISTP and INTP, and INxJ's should be confused between INTJ and INFJ. Why are there INTx's and INFx's confused between P/J? P/J is one of the biggest divides in the whole psyche. None of the functions are even the same between them. Such a confusion makes little sense. I'll never understand how people can be confused on that letter.
It confuses me a little too. My theory is that N shares with T the sense of being analytical and finding solutions to problems, whereas it shares with F the sense of being abstract and searching for meaning. So if you ask questions that aren't specific enough here, you could get opposite or inconclusive results.
But then, S could be confused with T and F for other reasons: T and S have a shared sense of being concrete and verifiable (as opposed to abstractness), whereas F and S share a sense of direct personal involvement (as opposed to impersonal analysis). About all they have in common is their effect on the structure/rhythm of type, which is kind of hard to measure.
If this is a correct assessment S and N are more different from each other than they are from either J trait, and T and F are more different from each other than either P trait.
Basically the difference between INTJ and INTP is which one prefers to introvert/extrovert their abstract side versus concrete, since both have strong "analytical" aspects and weak "involvement".
Then ISTP and ISTJ e.g. are different based on which one introverts/extroverts their analytical side versus involvement, as both have strong "concrete" and weak "abstract".
As to the possibility that I'm ISTP... I've considered the possibility.
Maybe the high Te score could be considered a form of Se in disguise... It just seems my physical skills are a bit weak for ISTP. I seem to get distracted from physical things rather easily, whereas I can get immersed in theory for days on end, even forgetting to eat and such. I'd certainly be an odd duck if I was one.