Pew Research Center designed this study to assess the current state of online survey sampling methods – both probability-based and opt-in – and determine their accuracy on general population estimates ...

Pew Research Center’s cross-national studies are fielded in a range of polling environments, from countries where telephone surveys are regularly ... Survey Mode and Sample Design; OTHER RESEARCH ...

Yet too few questions are being asked by clients and research suppliers around this critical issue. Here are five questions to be asking about your samples: Is your sample representative of your ...

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