Cluster sampling is considered to be less precise than other methods of sampling. However, it may save costs on obtaining a sample. Cluster sampling is a two-step sampling procedure.

Outcome-dependent sampling designs are strategic methodologies in longitudinal research that prioritise the selection of study subjects based on observed outcomes. Rather than relying on random ...

Destructive Sampling: Requests to destructively sample type or rare specimens will be denied. Any remaining material following destructive sampling must be returned to the Paleontology Section. It ...

Detailed information on Pew Research Center international survey meethodology, such as mode of interview, sampling design, margin of error, and design effect, for each country we survey, organized by ...

How Attribute Sampling Works . Let's say an auditor wants to test the effectiveness of a company's rule that purchases of more than $10 must be authorized with a purchase order.

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.