Research and application of conditional probability decision tree algorithm in data mining

Decision tree algorithm is a very active research area of data mining. This paper describes the basic decision tree idea in data mining, then discusses the computational complexity of the classical decision tree algorithm (ID3 algorithm). And the improved algorithm to construct a decision tree by using statistical theory and ideas of conditional probability is proposed in this paper. Experiments show that the computational complexity of this decision tree algorithm is superior to the traditional algorithm, and its efficiency is greatly improved.