calculate statistics on data, display linear/non-linear/curve fitting overlay on top of graphs

It would be nice to be able to calculate statistics, do regression analysis, fit some curves over our existing data. A simple example would be the ability to overlay a simple linear regression on top of a disk space usage graph. Even if not projecting into the future (which would be awesome!).

I currently do some of this myself by pulling values out of the API and doing the math myself to programmatically answer questions like \'\'when will we run out of disk space\'\'?