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arXiv · 2606.28574

Correct codes for the wrong reasons? validating LLMs as measurement instruments for theoretical constructs

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.

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Manuel Pita. 2026-06-26. Correct codes for the wrong reasons? validating LLMs as measurement instruments for theoretical constructs. https://arxiv.org/abs/2606.28574

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