20. The computer-implemented model repository system of claim 19 , further comprising: a mini-index associated with the tree-type index for storing a sub-set of the attributes stored in the tree-type index.
20. The computer-implemented model repository system of claim 19 , further comprising: a mini-index associated with the tree-type index for storing a sub-set of the attributes stored in the tree-type index. 21. The computer-implemented model repository system of claim 20 , wherein the attributes stored in the tree-type index include a plurality of splitting variables associated with the decision tree algorithm.