Description Usage Arguments Value Author(s) References See Also Examples
The quality
function computes several quality criteria
for the result of a SOM algorithm.
1 |
sommap |
A |
quality.type |
The quality type to compute. Two types are implemented:
|
... |
Not used. |
The quality
function returns either a numeric value (if only
one type is computed) or a list a numeric values (if all types are computed).
The quantization error calculates the mean squared euclidean distance between the sample vectors and their respective cluster prototypes. It is a decreasing function of the size of the map.
The topographic error is the simplest of the topology preservation measure: it calculates the ratio of sample vectors for which the second best matching unit is not in the direct neighborhood of the best matching unit.
Madalina Olteanu olteanu@ceremade.dauphine.fr
Nathalie Vialaneix nathalie.vialaneix@inrae.fr
Polzlbauer G. (2004) Survey and comparison of quality measures for self-organizing maps. In: Proceedings of the Fifth Workshop on Data Analysis (WDA'04), Paralic, J., Polzlbauer, G., Rauber, A. (eds) Sliezsky dom, Vysoke Tatry, Slovakia: Elfa Academic Press, 67-82.
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