About explicit encoding

[sehilyi]

• can be a separate chart or a annotation
• consider splitting the original explicit encoding to two
• highlight specific two bars for effective comparison (refer to [Four Experiments on the Perception of Bar Charts])

[sehilyi]

Should add simple highlighting method for comparison targets

A possible implication of this result is that if visualization users must make unaligned bar comparisons in a stacked bar charts, interactive visual techniques such as highlighting, which help the user visually separate the bars of interest from the surrounding distractors should help users make more accurate comparisons. - Four Experiments on the Perception of Bar Charts