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4 Types of FFM Profiles Discovered

This is the first large scale empirical research to find that personality type categories exist. This follows because Five-Factor Model Trait profiles of 1.5 million people sort into 4 type-like clusters. The empirical study was done by scientists at Northwestern University.

https://news.northwestern.edu/for-journalists/press-kits/scientists-determine-four-personality-types-based-on-new-data?