What we learned about online nonprobability polls | Pew Research Center

http://www.pewresearch.org/fact-tank/2016/05/02/q-a-online-nonprobability-polls/

probability poll, where a sample of randomly selected adults is polled and results are used to measure public opinion across an entire population. But the cost of these traditional polls is growing each year, leading many pollsters to turn to online nonprobability surveys, which do not rely on random sampling and instead recruit through ads, pop-up solicitations and other approaches.

Thanks. God bless.

Aaron

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