Title: Is the PEW Research Center biased? - Quora
Headings: Is the PEW Research Center biased?
Is the PEW Research Center biased?
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What is the significance of the Pew Research Center's worldwide survey of Muslims concerning their views about Sharia Law?

Content: Their method for reducing errors of bias is transparent and published. 2. Reducing bias on benchmarks - Pew Research Center Methods
It’s funded mostly by the Pew Trust which was a bit skewed early in its history, but have evolved to non-partisan funding. Pretty much a gold standard for this kind of thing. I refer to their research and findings very regularly. Their long-time period sampling of sentiment on multiple subjects is incredibly useful to track changes in sentiment, especially for US voters of course
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They are one of the most credible broad public policy polling organizations in the world. Their method for reducing errors of bias is transparent and published. 2. Reducing bias on benchmarks - Pew Research Center Methods
It’s funded mostly by the Pew Trust which was a bit skewed early in its history, but have evolved to non-partisan funding. Pretty much a gold standard for this kind of thing.