- Wikipedia 似乎比 Encyclopedia Britanica 偏左；
- 文章修改次数越多，政治偏向越少。
所以 Wikipedia 作者在写文章的时候，尤其是和政治有关的文章，不受自己个人立场的 bias 影响几乎是不可能的事。有人的地方就有江湖：还是要靠多方修改，多方制约，才能达到一个相对的平衡。
Wikipedia 外面的世界亦然。
(摘抄) Ideological bias on Wikipedia
In a subsequent study, the same researchers compared about 4,000 Wikipedia articles related to U.S. politics (written by an online community) with the corresponding articles in Encyclopædia Britannica (written by experts) using similar methods as their 2010 study to measure "slant" (Democratic vs. Republican) and to quantify the degree of bias. The authors found that "Wikipedia articles are more slanted towards Democratic views than are Britannica articles, as well as more biased", particularly those focusing on civil rights, corporations, and government. Entries about immigration trended toward Republican. They further found that "[t]he difference in bias between a pair of articles decreases with more revisions" and, when articles were substantially revised, the difference in bias compared to Britannica was statistically negligible. The implication, per the authors, is that "many contributions are needed to reduce considerable bias and slant to something close to neutral"
