Boxplots of robustness comparison of KSD and PageRank. We randomly generate contaminated graphs with a certain percentage of incorrect annotations. Ranking error is defined as the difference percentage of the top 100 ranking list on the contaminated graph and the original graph. The boxplots are based on 10 random replications. KSD has a lower ranking error than PageRank. It shows that KSD is more robust than PageRank against incorrect annotations.