Every polling average makes methodological choices about which polls to include and how much influence each should have. This methodology is used for both the NBC News presidential approval average and the generic congressional ballot average.
\n\nWhile the underlying calculations differ slightly to reflect the characteristics of each type of polling, the overall approach is the same.
\n\nOur approach emphasizes five principles:
\n\nAverages not predictions. Instead, they aim to provide the clearest possible aggregate measure of the current available polling.
\n\nThe NBC News presidential approval average includes publicly available national polls measuring presidential job approval. Polls of all adults, registered voters and likely voters are all eligible for inclusion, as are polls with a partisan affiliation provided those surveys meet certain methodological transparency requirements. Polls with partisan affiliations are noted as such whenever possible.
\n\nNBC News collected all the surveys included in the average. NBC News also sponsors its own independent national polls, the NBC News Poll and the NBC News Decision Desk Poll. Those polls are included in the average, and you can read more about those polls below.
\n\nTo be eligible for inclusion in the average, a polling organization must, at minimum, meet methodological transparency standards by reporting…
Original source: https://www.nbcnews.com/