WEST LAFAYETTE, Ind. — Companies and governments have regularly invested in solar farms and lost money when weather degradation unexpectedly cut panel lifetime short. As electricity generated from ...

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, ...

This paper develops an econometric panel data model that can be used both to identify the dynamic effects of disease transmission factors and to forecast disease spread. The empirical model is derived ...