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pew research center pew methods 101 methods methodology research data data science statistics survey data visualization weighting

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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. Pew Research Center is a nonpartisan fact tank that informs the public about the issues, attitudes, and trends shaping America and the world. We conduct public opinion polling, demographic research, content analysis and other data-driven social science research. We do not take policy positions. Check out http://www.pewresearch.org Check out our Youtube channel: http://www.youtube.com/user/PewResearchCenter Follow Pew Research Center on Twitter: http://www.twitter.com/pewresearch Or on Facebook: https://www.facebook.com/pewresearch