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Game Data Analysis – Tools and Methods by Coupart Thibault

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Typical traps of data visualization

In this section, we will highlight a few example cases where a bad design of the visualization tends to influence the judgment of the reader on the reality of the numbers.

The choice of the scale – values on axis

The following chart displays the evolution of Daily Active Users (DAU) on a timeline. Take some time, and look at it carefully:

The choice of the scale – values on axis

As we can see, the evolution seems to have lots of variations, and the curve also has a worrying decrease at the end of the month. Now let's have a glimpse at the same chart with 0 as a starting point for the unit on the y axis:

It definitely does not look so frightening! Though ...

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