Abstract
An application of a two-stage classifier to the prognosis of sacroileitis is presented in the paper. The method of classification is based on a decision tree scheme. A k-nearest neighbors is applied in pattern recognition task. In this model of classification a fuzzy loss function is used. The efficiency of this algorithm is compared with the algorithm based on zero-one loss function. In this paper also influence of choice of parameter λ in selected comparison fuzzy number method on classification results are presented.
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