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 ...

One possible explanation for the variability in estimates across the different nonprobability samples is the range of methods that online sample vendors employ. They differ on recruitment, weighting ...

This course will provide you with the requisite scientific knowledge and understanding of analytical method lifecycle management, which includes the activities of validation, verification, transfer, ...