Figure 9

3D biplots of the principal component analysis for objective and subjective metrics for both interfaces. Some metrics were removed for clarity. Subjects knowledge such as how familiar were participants with visualizations (know_vis) and how frequently they read news (read_news) are in blue. Objective metrics of time, precision and recall are in red. Subjective metrics of user’s perceived performance are in green. While precision and recall are related to previous user knowledge on the baseline, loading on the same direction of PC1, in Galean precision and recall are more related to user’s perceived performance and barely related to previous user knowledge.