用社会语言学方法构建与测量用户模拟中的角色保真度

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Abstract:As agentic systems gain commercial popularity, user simulators increasingly serve as measurement instrument for their evaluation. However, the fidelity of simulated users in comparison to real human users is generally low, and typically assessed by costly, subjective LLM judges. In this pilot study, we ask whether fidelity can instead be measured deterministically by treating a user persona sociolinguistically: as a social type that emerges from observable linguistic style, rather than one predicted by labels or descriptions a model must extrapolate into behaviour. We author personas as concrete stylistic rates, which lets us transfer two established, model-free instruments -- authorship-verification stylometry and lexicon-based content analysis -- as fidelity diagnostics. We A/B-test the sociolinguistic schema against a flat descriptive baseline across five task-oriented customer-service agents. Results show that the sociolinguistic schema improves both stylistic adherence and stylometric distinguishability for most of the tested models, with a caveat that persona style fidelity does not necessarily equal persona "naturalness". We argue that a sociolinguistic approach to persona design is a promising path towards more diverse and representative user personas, and that these metrics are most valuable in an error-attribution analysis, localizing where fidelity breaks down. This is a first step towards interventions that move user simulations closer to faithful renderings of diverse and variable linguistic outputs.

Comments:	Accepted to the UserSim @ NeurIPS 2026 workshop (non-archival)
Subjects:	Computation and Language (cs.CL)
Cite as:	arXiv:2610.10988 [cs.CL]
	(or arXiv:2610.10988v1 [cs.CL] for this version)
	https://doi.org/10.48550/arXiv.2610.10988 arXiv-issued DOI via DataCite (pending registration)

Submission history

From: Elena Khasanova [view email]
[v1] Wed, 7 Oct 2026 23:21:49 UTC (39 KB)