Especially, when you can obtain the multi type data which include the multi types whose frequency is small with the multi type analyses regarding gene multi types, the sample data reliability assessment method of being possible to appraise the reliability of these kind of multi type data objectively, and that the sample data reliability assessment device is offered are designated as topic. This invention calculates the typical distance between the same cluster samples and the typical distance between the strange cluster samples in every sample data on the basis of sample data set, calculates the reliability assessment index which is index in order to appraise the reliability of the sample data subclass which is subclass of sample data set on the basis of the group of one or more of typical distance between the same cluster samples which calculated and typical distance between the strange cluster samples, in every sample data subclass, appraises the reliability of sample data subclass in every particular sample data subclass on the basis of the reliability assessment index of one or more which was calculated.
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