Drawing bubble charts is an easy process. It could be done in Microsoft Excel easily. It is actually the variation of Scatter charts in which the points are replaced by bubbles.We use bubble charts when our data contains three set of values for three data series. It can be explained with the help of an example: Suppose we have three types of data: number of products, dollar value of sales and percentage size of market share.
In the bubble chart the size of the data is determined with the third data values.E.g. In the above example, when we draw the bubble chart the size of the bubble is determined by the Market share %.
The data in the bubble chart is represented by plotting the number of products on horizontal(X- axis), Sales amount are displayed on vertical (Y- axis), Market share percentages are represented by Size of bubbles.
WHERE TO USE BUBBLE CHARTS?
1. Bubble charts are used when specific values are to be represented more visually with the help of the varying size of the bubbles.
2. It is used when three values per data point are to be represented.
3. Bubble size can represent negative values.Even though the size of negative bubbles are represented through positive values , their data labels will show the true negative values.
4. It is used for plotting multiple data series.
Bubble charts are easy and organised way of effectively visualizing the data.
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