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Ipsative (pron.: //; Latin: ipse, "of the self") is a descriptor used in psychology to indicate a specific type of measure in which respondents compare two or more desirable options and pick the one that is most preferred (sometimes called a "forced choice" scale). This is contrasted with measures that use Likert-type scales, in which respondents choose the score (e.g. 1 to 5) which best represents the degree to which they agree with a given statement (see also Norm-referenced test). "Ipsative Comparisons" are also sometimes used in standardized testing to compare significant differences in subtest scores.
While mean scores from Likert-type scales can be compared across individuals, scores from an ipsative measure cannot. To explain, if an individual was equally Extroverted and Conscientious and was assessed on a Likert-type scale, each trait would be evaluated singularly, i.e. a respondent would see the item "I enjoy parties." and agree or disagree with it to whatever degree reflected his/her preferences.
If the same traits were evaluated on an ipsative measure, respondents would be forced to choose between the two, i.e. a respondent would see the item "Which of these do you agree with more strongly? a) I like parties. b) I keep my workspace neat and tidy." Ipsative measures may be more useful for evaluating traits within an individual, whereas Likert-type scales are more useful for evaluating traits across individuals. Additionally, ipsative measures may be useful in identifying faking.
In education, ipsative assessment is the practice of assessing present performance against the prior performance of the person being assessed. One place where this might be implemented is in reference to tests used with K-12 students in the United States, where value-added modeling of teacher performance is currently popular.
Ipsative assessment can be contrasted with criterion-referenced assessment and norm-referenced assessment. Ipsative assessment is used in everyday life, and features heavily in physical education and also in computer games. Encouraging pupils to beat their previous scores can take peer pressure out of situations and eliminates the competitive element associated with norm-based referencing. It can be particularly useful for children with learning disabilities and can improve motivation.
See also 
- Concept inventory
- Criterion-referenced assessment
- Norm-referenced assessment
- Psychological assessment
- Standardized test
- Two-alternative forced choice
- Baron, Helen (1996). "Strengths and Limitations of Ipsative Measurement". Journal of Occupational and Organizational Psychology 69: 49–56. doi:10.1111/j.2044-8325.1996.tb00599.x. Retrieved 2007-11-30.
- "Reducing faking in tests". Changing Minds. Retrieved 2007-11-30.
Further reading 
- Blinkhorn,S, Johnson, C and Wood, R. (1988). "Spuriouser and spuriouser:The use of ipsative personality tests." Journal of Occupational Psychology,61,153-162.
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