Survey sampling and estimation methods form the cornerstone of modern statistical inference, underpinning research across the social, medical, and natural sciences. At their heart, these methods ...

Greg DePersio has 13+ years of professional experience in sales and SEO and 3+ years as a writer and editor. Robert Kelly is managing director of XTS Energy LLC, and has more than three decades of ...

Black Americans constitute a population that is multicultural, regionally distinctive and often underrepresented in surveys. While most national public opinion surveys allow researchers to study ...

Clinical trial samples collected for pharmacogenomic and future research are vital resources for the development of safe and effective drugs, yet collecting adequate, representative sample sets in ...

A research proposal is a structured document detailing your proposed research plan. It helps assessors determine how feasible your research is and the methodological quality of your study. It can be ...

Many marginalized populations face severe health inequities in developed countries. These include people who are poor, homeless, sell sex or use alcohol or illegal drugs. In Toronto, an estimated 19% ...

About Pew Research Center’s Spring 2025 Global Attitudes Survey Results for the survey are based on a mix of telephone, face-to-face and online interviews ...