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https://adfontesmedia.com/about-the-int ... ias-chart/Overall news source scores are generated based on scores of individual articles. Each individual article is rated by least three human analysts balanced by left, right, and center self-reported political viewpoints. That is, at least one person who has rated the article self-identifies as being right-leaning, one as center, and one as left-leaning. Sometimes articles are rated by larger panels of analysts for various reasons.
For each news source, we pick a sample of articles that are most prominently featured on that source’s website over several news cycles. We typically have at least 10-15 articles rated per source, but for larger sources (such as the New York Times and Washington Post) we have over 100 articles in our sample. We rate all types of articles, including those labeled analysis or opinion by the news source, and the dominant factor for how we select articles from a page is prominence.
Each overall source score is a weighted average of the individual article scores. Our weighting algorithm has changed over time to try to capture the effect that individual articles with low reliability or high bias have on overall perceptions of the news source and is subject to change in the future. Notably, in the most recent update of this interactive chart, (August 2020), we updated our weighting algorithm to increase weighting of bias scores.
While previous iterations have weighted low reliability scores heavily, they have not weighted bias scores. In the current weighting algorithm, bias scores falling into the skews left/right, hyper-partisan left/right, and most extreme left/right categories receive increasingly heavier weights. The most notable effect of this change was that certain sources near the top middle received slightly greater net bias scores. For example, The New York Times and Washington Post moved a few points to the left, and WSJ moved a few points to the right. We believe this weighting better accounts for the impression of bias that these sources’ opinion and analysis content conveys.