Characteristics of the silhouettes of a range of hierarchical partitionings of the R-mode SOM grid.

The silhouettes analysis [5] corresponds to the calculation of for every object in the data set, where is a measurement of how well object matches its assigned cluster. corresponds to the average , to the minimum , to the maximum and to the number of objects that have a negative . Values of S near one indicate that the object is very well clustered, whereas negative S indicates that the object might be assigned to the wrong group.