Table 2.

Three Main Factors Used to Calculate the Altmetric Score

Volume	Sources	Authors
The score for an article rises as more people mention it. Only 1 mention from each person per source is counted. If someone tweets about the same paper more than once, Altmetric will ignore all but the first.	Each category of mention contributes a different base amount to the final score. For example, a newspaper article contributes more than a blog post, which contributes more than a tweet.	Altmetric looks at how often the author of each mention talks about scholarly articles, at whether or not there’s any bias towards a particular journal or publisher and at who the audience is. For example, a researcher sharing a link with other researcher counts for more than a journal account pushing the same link out automatically.

Information adapted from https://www.altmetric.com/about-our-data/the-donut-and-score/ and last accessed December 5, 2017.