Discover how attribute sampling enhances audit accuracy by evaluating internal controls and analyzing population traits, ...

Discover how simple random sampling ensures accurate and unbiased population research, offering efficiency and fairness over ...

Here at Pew Research Center, we are often asked about how we conduct our research. We work hard to make our methodologies transparent and understandable, but we also know that survey mode effects and ...

The first video in Pew Research Center’s Methods 101 series helps explain random sampling – a concept that lies at the heart of all probability-based survey research – and why it’s important. Fresh ...

Traditional grab sampling methods require supplementary devices such as electric pumps, batteries, charging devices, calibrators, tubing, connectors, and auxiliary equipment. The collection of whole ...

The World Health Organization (WHO) warns that air pollution is of great concern and impacts health in many ways. To better the situation, it’s necessary to focus on air quality. However, when ...

In an article published by Policy@Manchester, Stephanie Gillibrand, Caroline Sanders, Emma Crosbie and Jennifer Davies argue that a national rollout of self-sampling methods including a novel urine ...

Agricultural soil testing is critical to determining soil’s nutrient concentration and variability across your fields. It is ideal to test your fields’ soil at least every two to three years to inform ...