Replication Data for: Measuring Partisanship as a Social Identity in Multi-Party Systems

There is no doubt that partisanship is a powerful influence on democratic political behavior. But there is also a lively debate on its nature and origins: Is it largely instrumental in nature and shaped by party performance and issues stances? Or is it basically a long-standing expressive identity reinforced by motivated reasoning and strong emotion? We assess the nature of partisanship in the European context, examining the measurement properties and predictive validity of a multi-item partisan identity scale included in national surveys conducted in the Netherlands, Sweden, and the U.K. Using a latent variable model, we show that an eight-item partisan identity scale provides greater information about partisan intensity than a standard single-item and has the same measurement properties across the three countries. In addition, the identity scale better predicts in-party voting and political participation than a measure of ideological intensity (based on both left-right self-placement and agreement with the party on key issues), providing support for an expressive approach to partisanship in several European democracies.毋庸置疑，党派认同（partisanship）对民主政治行为具有极强的影响力。但学界围绕其本质与起源也存在激烈争论：它是否在本质上主要是工具性的，由政党执政表现与议题立场所塑造？抑或本质上是一种长期存在的表达性认同，经由动机性推理与强烈情绪得以强化？本研究针对欧洲语境下的党派认同本质展开评估，考察了荷兰、瑞典与英国三国全国调查中纳入的多条目党派认同量表的测量学特性与预测效度。借助潜变量模型，我们发现，相较于标准单条目量表，八条目党派认同量表能够提供更多关于党派认同强度的信息，且在三国中具有一致的测量学特性。此外，相较于基于左右自我定位与政党关键议题契合度构建的意识形态强度测量工具，该认同量表能够更好地预测本党投票与政治参与行为，从而为欧洲若干民主国家的党派认同表达性路径提供了实证支持。