I'd be more inclined to take MBTI seriously if it dropped the flirt with predestination and stopped trying to pretend to have some claim as Big Five's smaller cousin.
Otherwise, I'd like to know why I've changed MBTI types 3 times in 5 years, sometimes by a big margin. :)
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(Not to mention big five's only saving grace is a few predictive correlates. It, too, is quite bad at what it claims to do.)
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Most sciences: "This effect size is nothing to write home about."
Psychologists: "This statistically significant result is WORD OF GOD, PLEB."