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the results were very accurate; for others, not so accurate. The INTJ assessment was the least
accurate of all (read here). 43
The mistyping study found 449 people that tested as INTJs out of a larger pool of 8,836 people.
This was the “reported type.” However, after examination by type practitioners, it turned out that in
fact 698 of the testees were INTJs. This is called the “best fit type.”
Initially, it appeared that INTJs composed only 5.1% of the group. 44 But after correction, it turned
out that they composed 7.9% of the group—an increase of 154%. So the current MBTI test gives a
quantity of INTJs that is much lower than in reality.
Therefore we are left with the very real question of how far we can trust studies dealing with habits
and traits of INTJs. Whenever you read a study that says, “10% of INTJs in the sample preferred
the following...” what you are actually reading is, “10% the INTJs in the sample preferred the
following, while an additional mistyped 5% preferred something unknown...” Unfortunately there’s
not much one can do about this problem. INTJ data is going to be somewhat skewed toward a
potentially unrepresentative subset which ignores about one third of the actual INTJ population.
Bear that in mind as you read this book.
43 Schaubhut, Herk & Thompson, 2009
44 If you're wondering why 5.4% is so different from the 2 – 4% described earlier, it is because this group was not
intended to be a representative population—it was simply a sample used for the purposes of testing how well the
MBTI worked.