Correction: The penumbra of open source: projects outside of centralized platforms are longer maintained, more academic and more collaborative

After publication of this article [1], the authors reported that a wrong figure appeared as Fig. 5; the figure should have appeared as shown below.

Figure 5

Comparing academic and non-academic Penumbra repositories to GitHub. Fifteen percent of Penumbra hosts are “academic” under our definition, representing 37% of all Penumbra repositories. We find that academic repositories are maintained for about as long as non-academic Penumbra repositories, so academic development practices do not drive the divergence from GitHub development patterns that we observe. Academic repositories have fewer editors per file than non-academic Penumbra repositories, however, more closely matching development practices seen on GitHub. This refutes the hypothesis that the Penumbra differs widely from GitHub primarily due to academic influence

The original article [1] has been updated.