The thing about telling stories through data is, sometimes you don’t know what the story is until you’ve visualized the data. And if the story isn’t what you expected, you may have to either:
A. tell the “new” story as it is, or
B. find another set of data and another story to tell.
Unfortunately, sometimes the commissioner of the visualization may ask you to go with option
C. tweak the visualization, or even the data, so it shows the story they want to tell.
In the past, the team at Visual.ly has been asked to crop axes in order to exaggerate trends in a chart. The argument is that “as long as the axis is labeled correctly, it is okay”.
It would be nice if this were true, but it is not. If we are to truly do visualization, then all of the information related to the chart should... keep reading