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Abstract

In a clustering apparatus comprising an input unit (1) supplied with a dataset including a plurality of samples, a data processing unit (4) for processing the samples to classify each sample into a class, and an output unit (3) for producing a processing result representative of classification, a parameter memory (51) in a memory unit (5) memorizes a target parameter obtained from past experiment. A parameter estimating section (24) of the data processing unit estimates a clustering parameter by the use of the target parameter memorized in the parameter memory. An unidentifiable sample detecting section (25) of the data processing unit detects a sample as an unidentifiable sample if posterior probabilities calculated for the sample by a probability density function produced by the clustering parameter estimated by the parameter estimating section are smaller than a predetermined value.

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