Visualizing with Clarity - Data Points: Visualization That Means Something - page 580

FI G U R E 5- 41 Showing changes instead of raw values
WRAPPING UP
You get leeway as you explore data on your own. However, if you want to make
actionable insights based purely on your graphics, you must make sure you're
seeing the right thing. You wouldn't want to make a poor decision because
you visualized your data inaccurately.
Similarly, as you present your graphics to others or pass them onto the rest
of the world, where others might make decisions based on what you show,
it's your responsibility to display the data accurately. Differentiate elements,
highlight important bits, and annotate to explain and describe the data.