IRT-Based Item Quality Diagnostics
HR & WorkReliability: method-level3 sample items
About this scale
A method using item-response theory to evaluate item discrimination, difficulty, and information across the latent trait. Identifies poor items, redundant items, and trait coverage gaps.
Sample item(s)
“Estimate item discrimination (a parameter) — higher is better”
“Estimate item difficulty (b parameter) — should span trait range”
“Examine item information functions for coverage”
Reliability
Reported internal consistency: method-level. As a rule of thumb, Cronbach’s α ≥ .70 is considered acceptable, ≥ .80 good, and ≥ .90 excellent for established measures.
Notes
Foundational IRT-for-psychologists text.
Source & citation
Embretson, S. E., & Reise, S. P. (2000): Item Response Theory for Psychologists. Lawrence Erlbaum.
Embretson, S. E., & Reise, S. P. (2000): Item Response Theory for Psychologists. Lawrence Erlbaum.
Source. Scale details are summarised from the publication cited above. Always consult the original source for the full item set, scoring, and permission to use.
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