Methods 101: What are nonprobability surveys? - Pew Research Center Methods | Pew Research Center
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Our latest Methods 101 video explores some of the ways these surveys differ from traditional probability-based polls.
How do pollsters conduct surveys online and what does that mean for their accuracy? For decades, the gold standard for public opinion surveys has been the probability-based telephone poll, which starts with a random sample from virtually the entire population. But in recent years, two major developments have led many researchers to turn to a new method, polling online using non-probability samples, also known as online opt-in polls. There are two main reasons for this shift. First, it’s become harder for pollsters to get the people they randomly select to actually respond to the surveys.…
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