Authorship Norms and Project Structures in Science

Scientific authorship has become a contested terrain in contemporary science. Based on a survey of authors across fields, we measure the likelihood of specialist authors (sometimes called “guest” authors): people who only made specialized contributions, such as data, materials, or funding; and “nonauthor collaborators” (sometimes referred to as “ghost” authors): those who did significant work on the project but do not appear as authors, across...