Correct codes for the wrong reasons? validating LLMs as measurement instruments for theoretical constructs
While LLMs may agree with human annotators in coding text, reliability does not guarantee construct validity. This paper proposes 'grain calibration,' which decomposes a construct into clause-level components, tests each with extractive evidence, and combines results via an explicit rule. This reveals the process behind coding, shifting validation from output comparison to demonstrating that the model runs on the construct specified by its theory.
[2606.28574] Correct codes for the wrong reasons? validating LLMs as measurement instruments for theoretical constructs
[Submitted on 26 Jun 2026]
Title:Correct codes for the wrong reasons? validating LLMs as measurement instruments for theoretical constructs
View a PDF of the paper titled Correct codes for the wrong reasons? validating LLMs as measurement instruments for theoretical constructs, by Manuel Pita
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Abstract:When a large language model (LLM) codes a construct in text as a human annotator would, that agreement makes the LLM a reliable coder. Yet reliability leaves construct validity untouched. The instrument may be theory-naive, reaching the code through a correlate that meets none of the demands the construct's theory makes, and no current method tells that apart from genuine measurement. We propose grain calibration as a method that closes the gap. It decomposes a construct into clause-level components, tests each against the text with extractive evidence, and combines the results through an explicit, theory-derived rule. Because the rule is stated rather than lodged in one opaque pass, its structure is evidence about the process rather than the output. It shows which components settled a code, and, when the code is wrong, whether a component was missed or an adjacent construct mistaken for it. Validation shifts from scoring an instrument's outputs against an annotator to showing that the instrument runs on the construct its theory specifies.
Subjects:
Computation and Language (cs.CL); Artificial Intelligence (cs.AI); Computers and Society (cs.CY)
Cite as: arXiv:2606.28574 [cs.CL]
(or arXiv:2606.28574v1 [cs.CL] for this version)
https://doi.org/10.48550/arXiv.2606.28574
arXiv-issued DOI via DataCite (pending registration)
Submission history
From: Manuel Pita PhD [view email] [v1] Fri, 26 Jun 2026 19:58:39 UTC (39 KB)
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