>>12759363Not familiar with the others, just Big 5 and MBTI, but the issue with MBTI relative to big 5 is that people ahead of time decided there are 4 dimensions. With Big 5 the 5 dimensions came out of the factor analysis. When you do factor analysis, no matter how many dimensions (ie questions) you start with, you'll end up with only a few having significant (meaning greater than 1, or falling significantly above the others) eigenvalues. In the case of personality, people found 5.
I did a project on this, just for fun using survey data and found 6-7 factors using factor analysis (one was borderline). Three of them were wrapped into openness, they were something like 'I like ideas', 'I like art', and 'I like music' or something like that. It was purely statistics.
