Normative vs Ipsative Measurement 2 Flashcards
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Read the first 6 Normative vs Ipsative Measurement 2 flashcards as text
A recruiter reports that a military applicant scored at the 78th percentile on emotional stability using TAPAS. What does this normative score convey?
Answer: The applicant scored higher on emotional stability than 78% of the reference norm group
Normative scores express standing relative to a reference population. A 78th percentile score means the individual outperformed 78% of the norm group on that trait, enabling direct between-person comparisons — the defining feature of normative measurement.
In an ipsative scoring system, if a test-taker's score on the trait 'Dominance' increases by 5 points, what must necessarily occur across the remaining traits?
Answer: At least one other trait score must decrease to preserve the fixed total sum
Ipsative scores operate under a constant-sum constraint — the total points distributed across all traits is mathematically fixed. Any gain on one trait must be offset by losses elsewhere, which is why ipsative scores produce artificial negative inter-trait correlations.
Why do forced-choice personality item formats tend to resist deliberate faking better than Likert-scale formats?
Answer: Forced-choice items pair statements matched for social desirability, eliminating a universally safe response
Forced-choice formats pair items equated for social desirability, so test-takers cannot simply endorse every attractive-sounding statement. Choosing between two equally desirable traits forces a genuine relative preference, curtailing the strategic endorsement that inflates Likert scores.
Which of the following is a psychometrically appropriate use of ipsative personality scores?
Answer: Identifying an individual's relative strengths and weaknesses within their own trait profile
Ipsative scores are valid for within-person profile interpretation — they accurately reflect which traits are comparatively stronger or weaker for a single individual. Between-person comparisons, external criterion correlations, and group norm development all require normative scores free from the constant-sum constraint.
The Thurstonian IRT model was introduced into personality measurement primarily to solve which technical problem?
Answer: The ipsativity problem — recovering normative trait-level estimates from forced-choice response data
Brown and Maydeu-Olivares developed the Thurstonian IRT model specifically to extract normative trait estimates from forced-choice responses. By modeling the latent utilities underlying each item choice, the framework overcomes the constant-sum constraint that ordinarily limits forced-choice data to ipsative interpretation.
A research team finds that the inter-trait correlations from a forced-choice battery are uniformly negative across all trait pairs. What is the most likely explanation?
Answer: The forced-choice format produced ipsative scores, which carry a built-in negative correlation artifact
Ipsative data's constant-sum constraint mathematically forces the average inter-trait correlation to be negative — if one trait score rises, others must fall. Uniform negative correlations in a forced-choice battery are therefore a hallmark of ipsativity, not a reflection of true trait relationships.