Repeated measurements of the same countries, people, or groups over time are vital to many fields of political science. These measurements, sometimes called time-series cross-sectional (TSCS) data, allow researchers to estimate a broad set of causal quantities, including contemporaneous and...

Why the Supreme Court agrees to hear cases is among the most important topics in judicial politics. However, existing theories have overlooked a key factor: the relative ideologies of the litigating parties. We develop and test a new theory that explicitly incorporates the ideology of the...