政黨政治向來為研究憲政運作、民主深化的核心議題。過往的研究，多將政黨政治視為影響憲政與民主的自變項，但憲政特性以及民主轉型的過程，也可能系統性的影響政黨體系，對於政黨體系變遷的規模、機率，存在一定的關連性。基於此，本文以政黨體系變遷為依變數，從制度特性以及民主化背景來觀察政黨體系變遷的特性。核心假設有三：首先，就制度特性而言，直選總統的國家，比起議會內閣制的國家，政黨體系變遷的機率較高、規模較大；第二，以選舉時程而言，也是制度面向的因素，在直選總統的國家中，同時選舉或蜜月選舉，因為總統衣..

Party politics is an important issue to explain the constitutional work and consolidation of a democracy, and especially for newly democracies. If the party system would be affected by different types of constitutional systems and historical legacy, the party system should also be changed. We have three hypotheses: first, we suppose those countries with a directly elected president will have a higher probability for party system change. And the smaller parties are more likely out of parliament. Second, based on the coattail effect, countrie..

在戰後日本民主憲政史上，2005 年舉辦的第 44 屆日本眾院議員選舉深受各界重視，特別是因為該屆選舉，是日本政治史上首度因重大政策遭國會否決，內閣首相逕予交付民意定奪的一項公民複決選舉。當時自民黨的執政內閣能否在改選中贏取民心，亦或由民主黨等在野黨派來更迭政權，不僅攸關小泉純一郎首相政治生命與改革路線的延續，更牽動日本未來政經局勢的發展走向，其重要性確實不容小覷。 有別於過往研究囿限於宏觀層次或質化的研究途徑，本文嘗試根據日本選舉研究..

The 44th Japanese House election in 2005 has played a significant role in its post-war democratic history and also drove a lot of attention in the academics. The importance of this election, regarded as the national referendum for the postal reform, relies on the fact that it is the first time the House is dismissed because of unsolved policy gridlock. The consequence of the election not only results in the destine of LDP coalition government and the political career of Prime Minister Junichiro Koizumi, but also the developme..