Understanding a political poll requires method: sampling, margin of error, questions, and bias matter more than the bold ...

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 ...

Probability sampling Sometimes, such as with smaller populations, we might be able to produce a sampling frame (i.e. a list of all items or people in the population). If so, then we could perhaps use ...

For the detection of community transmission of COVID-19, New Zealand currently relies on contact tracing, testing of self-selected people with symptoms and those with permission to travel between ...

With statistical sampling, counsel can simplify damage analyses, avoid potential issues with incomplete or missing data, and minimize the risk of error. In our prior ...