What is the equation of this graph? 
Definitions:
16PF
The Sixteen Personality Factor Questionnaire, a self-report assessment tool designed to measure normal-range personality traits based on 16 primary factors.
Raymond Cattell
A British and American psychologist known for his pioneering studies in personality, intelligence theory, and psychometrics.
MMPI-II
The Minnesota Multiphasic Personality Inventory-2, a comprehensive psychological questionnaire designed to assess a variety of psychological conditions and personality attributes.
Scale Purity
Scale purity is a concept in psychometrics referring to the degree to which items on a test measure a single, coherent construct or dimension, contributing to the test's validity.
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