The most commonly used statistical models of civil war onset fail to correctly predict most occurrences of this rare event in out-of-sample data. Statistical methods for the analysis of binary data, ...

The Forest Preserve District of Will County’s new ball python snake has a name thanks to hundreds of votes cast on social media. The name Penny was the top choice for the snake, which has joined the ...

A behind-the-scenes blog about research methods at Pew Research Center. For our latest findings, visit pewresearch.org. Identifying causal relationships from observational data is not easy. Still, ...