An Empirical Study on the Visual Cluster Validation Method with Fastmap

This paper presents an empirical study on the visual method for cluster validation based on the Fastmap projection. The visual cluster validation method attempts to tackle two clustering problems in data mining: ( I ) to veri f y partitions of data created by a clustering algorithm and ( 2 ) to identify genuine clusters from data partitions. They are achieved through projecting objects and clusters by Fastmap to the 2 0 space and visually examining the results by humans. A Monte Carlo evaluation of the visual method was conducted. The validation results of the visual method were compared with the results of two internal statistical cluster validation indices, which shows that the visual method is in consistence with the statistical validation methods. This indicates that the visual cluster validation method is indeed effective and applicable to data mining applications.