Specify the Bubble Size in a Bubble Chart
In a bubble chart, you use a measure or fact to determine the size of the bubbles.
You can use the Bubble Measure in the Measures drop zone of the chart to specify bubble size. You can then specify the size range of the bubbles in the chart. You can also specify what value the smallest bubbles represent. For example, your bubble measure is revenue, and you set the minimum and maximum bubble size to 5 pt and 20 pt, respectively. You set the smallest bubble to represent the value zero. All the bubbles on your chart will be between 5 and 20 pts and any bubbles between 0 and 5 pts on this scale will appear at 5 pt.
You can combine bubble size with colors by value to create a chart that shows multiple dimensions.