Replication Data for: Contagion from abroad. How party entry in Western Europe is influenced by party family members abroad, 1961-2016

New parties are a key mechanism behind party system innovation as voters are offered new choices. To explain party entry (i.e., participation in a lower house election for the first time), the state-of-the-art has typically focused on domestic determinants. This, however, assumes that party entry takes place in an international vacuum. Building on the policy diffusion literature, we explore how party family members abroad influence party entry in the focal country. Based on a new dataset on the evolution of each party family in 17 Western European party systems between 1961 and 2016, including 2191 new parties, our mixed-methods approach combining spatial econometric models with pathway case analysis demonstrates that party entry is influenced by the entry and electoral success of their party family abroad. This has important implications for the literature on party entry and the international diffusion of policy platforms.

新政党是推动政党制度创新的核心机制，因其为选民提供了全新的选择空间。为解释政党参选行为（即首次参与下议院选举），现有研究前沿通常聚焦于国内决定因素。然而，这一研究路径默认政党参选发生在不受国际因素干扰的真空环境中。本文依托政策扩散（policy diffusion）研究脉络，探讨境外同政党家族（party family）成员如何影响研究焦点国的政党参选行为。本文依托1961年至2016年间覆盖17个西欧政党体系、包含2191个新政党的各政党家族演化情况全新数据集，采用融合空间计量模型（spatial econometric models）与路径案例分析（pathway case analysis）的混合研究方法，实证结果显示：政党参选行为会受到其境外同政党家族成员的参选决策与选举获胜表现的显著影响。该发现对政党参选研究领域与政策主张国际扩散领域的相关文献均具有重要启示意义。