Categorisation

Categorisation is simply putting things into predeterimined categories.
If this problem could be solved in general, we'd pretty much have AI solved.
For example, if I could predict whether a given day was a good one to buy a particular stock or not, I'd quickly become very rich.
More typically, systems are developed to solve particular categorisation problems.
We have done a bit of work on this in my group and have the Middlesex Categorisation Page
It has a link to the University of California at Irvine's Categorisation Benchmark
Examples of problems are Breast Cancer, Credit Screening, Diabetes, Yeast and Chess Moves.
Typically a system is presented with correctly categorised items and learns to categorise items that it has not yet seen.
In general, the systems are not perfect.