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Princeton Researchers Develop a New Way to Map Influence

Using computer algorithms to directly measure how language changes over time — rather than taking the indirect approach of looking at link or citation rate — the new method gives another perspective on how influence works.

The Influence Project

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Princeton researchers have developed a new method that tracks the origins of influential ideas. The traditional way of measuring influence in academic journals is by citation count, and online search engines use links and traffic to determine which sites are most relevant to your search. The Princeton approach is more direct. By running computer algorithms on the actual text of a set of documents, and analyzing how their language changes over time, the researchers are able to track the origin and spread of new ideas.

The idea is that a paper that gains many citations, or a site that garners many links, might ultimately not lead to a real shift in thinking, despite its apparent popularity. The converse is also true: Papers and sites that evade widespread citation might nonetheless find channels of influence despite their apparent obscurity, perhaps simply by affecting the point of view of a handful of powerful people.

Though they tested their method on scholarly papers, the researchers say it should also be applicable to measuring influence in news stories, on the Internet–in theory, anywhere there is text to be crunched.

“We are also exploring the idea that you can find patterns in how language changes over time,” said Blei in a press release. “Once you’ve identified the shapes of those patterns, you might be able to recognize something important as it develops, to predict the next big idea before it’s gotten big.”

[Images: Flickr user brewbooks; inset: Frank Wojciechowski]

About the author

David Zax is a contributing writer for Fast Company. His writing has appeared in many publications, including Smithsonian, Slate, Wired, and The Wall Street Journal.

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