Lyu et al. (Psychometrika, 2023) demonstrated that item-specific factors can cause spurious effects on the structural parameters of IRTree models for multiple nested response processes per item. Here, we discuss some boundary conditions and argue that person selection effects on item parameters are not unique to item-specific factors and that the effects presented by Lyu et al. (Psychometrika, 2023) may not generalize to the family of IRTree models as a whole. We conclude with the recommendation that IRTree model specification should be guided by theoretical considerations, rather than driven by data, in order to avoid misinterpretations of parameter differences.

吕等人。（Psychometrika，2023）证明，项目特定因素可能会对每个项目的多个嵌套响应过程的 IRTree 模型的结构参数产生虚假影响。在这里，我们讨论了一些边界条件，并认为人员选择对项目参数的影响并非特定于项目特定因素所独有，并且 Lyu 等人提出的影响。（Psychometrika，2023）可能无法推广到整个 IRTree 模型系列。最后，我们建议 IRTree 模型规范应以理论考虑为指导，而不是由数据驱动，以避免对参数差异的误解。