Figure 4. Retrieval performance for all methods.

Mean and standard error of the AP scores for four variants of our framework, as well as for three Spearman correlation-based methods. Regarding the x-axis labels, “binary” indicates the binary significance matrix variant of our framework while “discrete” indicates the discrete significance matrix variant; “bin + IDF” and “disc + IDF” indicate those two same variants, but also performing the TF-IDF modeling step prior to establishing connections between studies; finally, the “max-SP”, “mean-SP”, and “median-SP” labels refer to the maximum, mean, and median statistic summarization approaches in the competing Spearman correlation methods.