Converting delimited text into checkboxes

 several ideas but let's take this step by step. If you create a new field of type Formula multi select text with this formula

Split(List(";",
[Cause 1], [cause 2], [Cause 3],   .... etc,  [Cause 9]))

then you will be able to use that field as a dynamic filter. It would not do any fancy percentage calculations for you but if there are not too many different causes then you could quickly filter your master list down and write down on a piece of paper :) how many came up on the filtered report as you cycle through each Dynamic Filter option in turn.

Do you have more ideas but why don't you start by doing that and post back. 

Also can you tell me whether or not you have access to a master list of the causes, or do you need to generate them out of the data.