What is difficult is to explain more deeply what “knowledge” has been mined from the data. If a stakeholder asks “What did your system learn from the data about my customers? On what basis does it make its decisions?” there may be no easy answer because there is no explicit model. Strictly speaking, the nearest-neighbor “model” consists of the entire case set (the database), the distance function, and the combining function. In two dimensions we can visualize this directly as we did in the prior figures. However, this is not possible when there are many dimensions. The knowledge embedded in
...more
