![]() The comparison is more accurate, but now the challenge is being able to distinguish the values in the different days because the heights of each column are so similar. In this example, the default chosen by PowerPoint makes the values for Day 2-5 look like they are double the value of Day 1, when that is not the case. This is especially true when there are no data labels and the audience is only comparing the height of the columns. This can lead to misinterpretation by the audience. What the programs seem to be trying to do is to make the difference in values easier to see by adjusting the starting value of the axis. The problem comes when the axis does not start at zero. It seems to depend on the values in the data. I haven’t been able to figure out how the programs select these values. For example, the vertical axis on a column graph is the measurement axis. ![]() ![]() ![]() By default, Excel and PowerPoint select the minimum and maximum values for the measurement axis on a graph. While I agree with them in most cases, I want to suggest an exception to this rule. If you read articles by data visualization experts on the topic of measurement axes that don’t start at zero, you will find one common theme: strong opposition to the idea. ![]()
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