Probability-based panel: This refers to a national survey panel recruited using random sampling from a database that includes most people in the population. Today, most such panels in the United ...

A behind-the-scenes blog about research methods at Pew Research Center. For our latest findings, visit pewresearch.org. Among the tools that survey researchers use to gain a deeper understanding of ...

Andrew J Tatem works for the University of Southampton, and is Director of WorldPop. His research on mapping populations has been funded by donors such as the Gates Foundation, Wellcome Trust, GAVI.

Demographics shape marketing, tax policies, and healthcare quality by profiling populations. Businesses use demographic data to tailor products and manage effective marketing. Investors should target ...