Item selection is a critical decision in modeling psychological networks. The current preregistered two-study research used random selections of 1,000 symptom networks to examine which eating disorder (ED) and co-occurring symptoms are most central in longitudinal networks among individuals with EDs (N = 71, total observations = 6,060) and tested whether centrality changed based on which items were included in the network. Participants completed 2 weeks of ecological momentary assessment (five surveys/day). In Study 1, we obtained initial strength centrality values by estimating an a priori network using eight items with the highest means. We then estimated 1,000 networks and their centrality from a random selection of unique eight-item symptom combinations. We compared the strength centrality from the a priori network to the distribution of strength centrality estimates from the random-item networks. In Study 2, we repeated this procedure in an independent longitudinal dataset (N = 41, total observations = 4,575) to determine if our results generalized across samples. Shame, guilt, worry, and fear of losing control were consistently central across networks, regardless of items included in the network or sample. Results suggest that these symptoms may be important to the structure of ED psychopathology and have implications for how we understand the structure of ED psychopathology. Existing methods for item inclusion in psychological networks may distort the structure of ED symptom networks by either under- or overestimating strength centrality, or by omitting consistently central symptoms that are nontraditional ED symptoms. Future research should consider including these symptoms in models of ED psychopathology. (PsycInfo Database Record (c) 2023 APA, all rights reserved).

中文翻译：

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中枢性饮食失调网络症状对项目选择和样本敏感吗？从网络角度对饮食失调精神病理学概念化的影响。


项目选择是心理网络建模中的关键决策。目前预先注册的两项研究研究随机选择了 1,000 个症状网络，以检查哪些饮食失调 (ED) 和同时出现的症状在 ED 个体的纵向网络中最重要（N = 71，总观察值 = 6,060），并测试是否中心性根据网络中包含的项目而变化。参与者完成了为期两周的生态瞬时评估（每天五次调查）。在研究 1 中，我们通过使用具有最高均值的八个项目估计先验网络来获得初始强度中心性值。然后，我们从随机选择的独特八项症状组合中估计了 1,000 个网络及其中心性。我们将先验网络的强度中心性与随机项网络的强度中心性估计的分布进行了比较。在研究 2 中，我们在独立的纵向数据集（N = 41，总观测值 = 4,575）中重复了此过程，以确定我们的结果是否可以跨样本推广。无论网络或样本中包含什么项目，羞耻、内疚、担忧和失去控制的恐惧始终是整个网络的核心。结果表明，这些症状可能对 ED 精神病理学结构很重要，并且对我们如何理解 ED 精神病理学结构具有影响。现有的将项目纳入心理网络的方法可能会通过低估或高估强度中心性，或者忽略作为非传统 ED 症状的一致中心症状，从而扭曲 ED 症状网络的结构。未来的研究应考虑将这些症状纳入 ED 精神病理学模型中。 （PsycInfo 数据库记录 (c) 2023 APA，保留所有权利）。