John Bowers, Clare Stanton, and Jonathan Zittrain:

We found that of the 553,693 articles within the purview of our study––meaning they included URLs on nytimes.com––there were a total of 2,283,445 hyperlinks pointing to content outside of nytimes.com. Seventy-two percent of those were “deep links” with a path to a specific page, such as example.com/article, which is where we focused our analysis (as opposed to simply example.com, which composed the rest of the data set).

Of these deep links, 25 percent of all links were completely inaccessible. Linkrot became more common over time: 6 percent of links from 2018 had rotted, as compared to 43 percent of links from 2008 and 72 percent of links from 1998. Fifty-three percent of all articles that contained deep links had at least one rotted link.