International Personality Item Pool

The International Personality Item Pool (IPIP) is a public domain collection of items for use in personality tests.[1] It is managed by the Oregon Research Institute.[2]

The pool contains 3,329 items.[3] These items make up more than 250 inventories that measure a variety of personality factors, many of which correlate well to better-known systems such as the 16PF Questionnaire and the Big Five personality traits. IPIP provides journal citations to trace those inventories back to the publication as well as correlation tables between questions of the same factor and between results from different inventories for comparison.[4][5][6] Scoring keys that mention the items used for a test are given in a list form;[7] they can be formatted into questionnaires.[8]

Many broad-bandwidth personality inventories (e.g., MMPI, NEO-PI) are proprietary. As a result, researchers cannot freely deploy freely those instruments and, thus, cannot contribute to further instrument development.[9] An additional problem is that these proprietary instruments are rarely revised, with some having items that are dated.[9] One purpose of IPIP is to remedy that situation.

The IPIP website does not provide any tests formatted for administration. However, websites that use the IPIP inventories for testing are available:

  • IPIP-NEO-120 is an IPIP version of the NEO-PI-R test.[10] The site is hosted by John A. Johnson, the author of the shorter equivalent inventory.[11] The longer equivalent from 1999 was created by Lewis Goldberg who also created IPIP.[12]
  • Open Source Psychometrics Project hosts Goldberg's 50-question version[13] of the Big Five traits and an IPIP emulation of the 16PF questionnaire.[14]

References
  1. Goldberg, L. R. "International Personality Item Pool: A scientific collaboratory for the development of advanced measures of personality and other individual differences". Archived from the original on 2014-05-24. Retrieved 2014-05-26.
  2. Lewis R. Goldberg; John A. Johnson; Herbert W. Eber; Robert Hogan; Michael C. Ashton; C. Robert Cloninger; Harrison G. Gough. "The international personality item pool and the future of public-domain personality measures".
  3. The 3,329 IPIP Items in Alphabetical Order (plus their Survey and Item Number*)
  4. "Single-Construct IPIP Scales". ipip.ori.org.
  5. "Multi-Construct IPIP Inventories". ipip.ori.org. Retrieved 6 March 2019.
  6. "16PF Comparison Table". Retrieved 6 March 2019.
  7. "Big-Five Factor Markers". Retrieved 6 March 2019.
  8. "Administering IPIP Measures, with a 50-item Sample Questionnaire". Retrieved 6 March 2019.
  9. [Rationale for the IPIP https://web.archive.org/web/20050313001046/http://ipip.ori.org/newRationale.htm]
  10. Johnson, John A. "IPIP NEO-PI, Introductory Information". Retrieved 6 March 2019.
  11. Johnson, John A. (August 2014). "Measuring thirty facets of the Five Factor Model with a 120-item public domain inventory: Development of the IPIP-NEO-120". Journal of Research in Personality. 51: 78–89. doi:10.1016/j.jrp.2014.05.003.
  12. Lewis R. Goldberg (1999). Mervielde, I.; Deary, I.; De Fruyt, F.; Ostendorf, F. (eds.). "A broad-bandwidth, public domain, personality inventory measuring the lower-level facets of several five-factor models" (PDF). Personality psychology in Europe. 7: 7–28.
  13. Goldberg, Lewis R. (1992). "The development of markers for the Big-Five factor structure". Psychological Assessment. 4 (1): 26–42. doi:10.1037/1040-3590.4.1.26.
  14. "Take a personality test - Open Source Psychometrics Project". Retrieved 6 March 2019.
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