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The four temperament theory is a proto-psychological theory which suggests that there are four fundamental personality types: sanguine, choleric, melancholic, and phlegmatic. [ 2 ] [ 3 ] Most formulations include the possibility of mixtures among the types where an individual's personality types overlap and they share two or more temperaments.
Personality can be determined through a variety of tests. Due to the fact that personality is a complex idea, the dimensions of personality and scales of such tests vary and often are poorly defined. Two main tools to measure personality are objective tests and projective measures.
Personality also predicts human reactions to other people, problems, and stress. [4] [5] Gordon Allport (1937) described two major ways to study personality: the nomothetic and the idiographic. Nomothetic psychology seeks general laws that can be applied to many different people, such as the principle of self-actualization or the trait of ...
Among four twin studies examined in 2003, the mean percentage for heritability was calculated for each personality and it was concluded that heritability influenced the five factors broadly. The self-report measures were as follows: openness to experience was estimated to have a 57% genetic influence, extraversion 54%, conscientiousness 49% ...
Effective personality typologies reveal and increase knowledge and understanding of individuals, as opposed to diminishing knowledge and understanding as occurs in the case of stereotyping. Effective typologies also allow for increased ability to predict clinically relevant information about people and to develop effective treatment strategies. [4]
The lexical approach (bottom up) is limited for two reasons, they claim. First, not all personality characteristics are well represented in natural language. [6] Second, personality characteristics occur at various levels of breadth, from narrow to wide, with wider characteristics taking up the majority of variance in factor analyses.
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The two-factor model of personality is a widely used psychological factor analysis measurement of personality, behavior and temperament. It most often consists of a matrix measuring the factor of introversion and extroversion with some form of people versus task orientation.