This tutorial from Flowing Data, provides a detailed guide on creating bubble charts using the software provided.
The tutorial covers how to create the variety of bubble chart that is like a scatterplot with a third, bubbly dimension.
The advantage of this chart type is that it lets you compare three variables at once. One is on the x-axis, one is on the y-axis, and the third is represented by area size of bubbles. Have a look at the final chart to see what we're making.
Below is the bubble chart that was created from the tutorial.