All sample frames are weighted together. Generally, weights are applied to age, race, education, and area variables. The Fox News poll is not weighted by party identification.

Some surveys are conducted among subgroups in the panel, such as Black Americans or young people, and may include a supplement sample (called “oversamples”) from another panel such as Ipsos’ ...

In statistics, sampling means selecting the group that you will collect data from in your research. Sampling errors are statistical errors that arise when a sample does not represent the whole ...