International Personality Item Pool – Five Factor Model – 50 (IPIP-Big5)

Description
The IPIP-Big5 is a 50 item self-report personality test designed to measure the Big Five personality traits, as expressed in Costa and McCrae’s (1992) revised NEO personality inventory (NEO-PI-R). This assessment is appropriate for people between the age of 16 and 81, with age and gender specific norms provided. The clinicians should therefore make sure the client date of birth details are entered in NovoPsych accurately.

The five domain constructs are:

– Extraversion – The tendency to seek stimulation, talkativeness and related to positive emotions.
– Agreeableness – The tendency to be compassionate and cooperative rather than suspicious and antagonistic towards others.
– Conscientiousness / Intellect – The tendency to show self-discipline, act dutifully, and aim for achievement.
– Emotional Stability – This is the reverse of the “neuroticism” subscale found on the NEO-PIR. Low scores on the Emotional Stability scale indicate the tendency to experience unpleasant emotions easily, such as anger, anxiety, depression, or vulnerability.
– Openness – Reflects the degree of intellectual curiosity, creativity and a preference for novelty and variety.

Validity
The IPIP-Big5 was developed by Goldberg (1999) using the International Personality Item Pool. It has been shown to correlate highly with the corresponding NEO-PI-R domain scores, with correlations that range from .85 to .92 when corrected for unreliability (International Personality Item Pool, 2001). The IPIP-5-50 scales also outperformed the NEO-PI-R versions of the same constructs as predictors of a number of clusters of self-reported behavioral acts. Buchanan, Johnson and Goldberg (2005) evaluated the validity with 2,448 participants. Factor analysis supported the construct formation, and correlated significantly with behavioral criteria.

Lamers et al (2012) conducted another validation study with a sample of 1161 Dutch participants between the ages of 18 and 88, stratified for demographic variables. Gow et al. (2005) also conducted a validation study with 906 participants in Scotland and provide gender and age related norms.

Interpretation
Results consist of five scores, one for each of the personality domains, scored from 10 to 50. Scores are also represented as percentiles for comparison to age and gender specific nonclinical sample (Gow et al. 2005). Low scores on Emotional Stability has been shown to correlate with psychopathology while higher extraversion and agreeableness is correlated with psychological well-being (Lamers et al 2012).

Developer
Goldberg, L. R. (1999a). A broad-bandwidth, public-domain, personality inventory measuring the lower-level facets of several five-factor models. In I. Mervielde, I. Deary, F. De Fruyt, & F. Ostendorf (Eds.), Personality psychology in Europe, Vol. 7 (pp. 7-28). Tilburg, The Netherlands: Tilburg University Press. http://ipip.ori.org/newBroadbandText.htm

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