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 ...

Probability-based panel: This refers to a national survey panel recruited using random sampling from a database that includes most people in the population. Today, most such panels in the United ...

“The Doctor Is In As Carson Ties Trump In GOP Race, Quinnipiac University National Poll Finds; Carson Tops Clinton By 10 Points In General Election” That was the headline on a press release ...