1. In a data visualization computing system implemented on an electronic computing device, a method of analyzing and graphically representing a correlation of a plurality of transaction items occurring within a physical locality, the method comprising the steps of: graphically representing on the electronic computing device the physical locality, the graphical representation on the electronic computing device including a graphical representation of a plurality of locations within the physical locality; retrieving data associated with the transaction items, the data including information on the location of the items within the physical locality; correlating the transaction items in a dimensionally reduced manner using the retrieved data; graphically representing the correlated transaction items as a graphical overlay over the graphical representation of the physical locality, the graphical representation of the correlated transaction items and the correlated transaction items being linked; creating a tree hierarchy using the retrieved data, wherein the tree hierarchy classifies the transaction items in a hierarchy according to a defined user understandable factor; graphically representing the tree hierarchy as a graphical textual tree hierarchy, wherein the graphical representation of the physical locality, the graphical overlay and the graphical textual tree hierarchy all displayed in a combined graphical representation, and wherein the graphical overlay and the graphical textual tree hierarchy are linked to the correlated transaction items; and graphically representing in the combined graphical representation an interaction between the correlated transaction items and at least one transaction item in the tree hierarchy by i) detecting by the electronic computing device a selection in one of the graphical overlay, graphical textual tree hierarchy and the graphical representation of the physical locality and ii) graphically representing how the graphical overlay, graphical textual tree hierarchy and the graphical representation of the physical locality are linked.