@inproceedings{jeong-etal-2026-investigating, title = "Investigating Assistant Bias in {LLM} User Simulators Using a Role Vector", author = "Jeong, Daeheon and Lee, Yoonjoo and Choi, Eugene and van der Ben, Sinie and Kim, Juho", editor = "Lee, Hung-Yi and Dev, Sunipa and Li, Jessy and Elliott, Desmond", booktitle = "Findings of the {A}ssociation for {C}omputational {L}inguistics: {EMNLP} 2026", month = oct, year = "2026", address = "Budapest, Hungary", publisher = "Association for Computational Linguistics", url = "https://aclanthology.org/2026.findings-emnlp.2426/", doi = "10.18653/2026.findings-emnlp.2426", pages = "52070--52104", ISBN = "979-8-89176-462-0" }