In the last year, geopolitical risk has emerged as a significant short-term driver of volatility. Firms with high sensitivity to geopolitical risk do not have long-term returns statistically different ...

The Hausman test evaluates the potential endogeneity of a regressor by examining an artificial regression that includes the residuals from a first-stage regression of the endogenous variable on the ...

Sample surveys often have complex sample designs with multistage cluster sampling, stratification, and differential selection probabilities. This article is concerned with testing the null hypothesis ...