I have to say that I've never heard of the Bubble option, so I looked it up
on support.sas.com (my go-to place for searches on customer problems or to simply to learn something about SAS). The search led me to documentation for the statement options in SAS ODS Graphics. So, I assume the author below is talking about an option to produce
a Bubble plot.
The explanation that support.sas.com
provided for me is, "Creates a bubble plot in which two variables determine the location of the bubble centers and a third variable controls the size of the bubble." So, I checked for two or three papers to start you on your journey:
Take a look at the papers, and then let me know if I'm on the right track or missed it altogether. Thanks!!