A **bubble plot** is a scatterplot where a third dimension is added: the value of an additional variable is represented through the **size of the dots**. You need 3 numerical variables as input: one is represented by the X

axis, one by the Y axis, and one by the size. Do not forget to provide a **legend **to make possible the link between the size and the value. Note that too many bubble make the chart hard to read, so this type of representation is

usually not recommended for big amount of data. Last but not least, note that the area of the circles must be proportional to the **area**, not to the **radius**, to avoid exaggerate the variation in your data.

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