Multivalue BIOS may result in inducing wrong knowledge from data set, and consequently result in the decline of the performance of decision tree.

多值偏向可能导致从数据集中归纳出错误的知识，使决策树的性能下降。

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Second, this paper proposes a new decision tree algorithm, AF algorithm, which avoids multivalue bios.

提出了一种避免了多值偏向问题的决策树算法——AF算法；

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Experiment is the traditional method for analysing multivalue BIOS of decision tree algorithm, but it has a fault that we must have the expertise of the specific field.

实验方法是分析决策树算法中的多值偏向问题的传统方法，其缺点是需要具备该数据领域的专家知识。

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