By Wai-Ki Ching, Michael Kwok-Po Ng
Facts mining and knowledge modelling are below speedy improvement. as a result of their huge purposes and examine contents, many practitioners and teachers are drawn to paintings in those parts. with a purpose to selling verbal exchange and collaboration one of the practitioners and researchers in Hong Kong, a workshop on info mining and modelling was once held in June 2002. Prof Ngaiming Mok, Director of the Institute of Mathematical examine, The college of Hong Kong, and Prof Tze Leung Lai (Stanford University), C.V. Starr Professor of the collage of Hong Kong, initiated the workshop. This paintings includes chosen papers provided on the workshop. The papers fall into major different types: info mining and knowledge modelling. facts mining papers take care of trend discovery, clustering algorithms, category and sensible purposes within the inventory industry. info modelling papers deal with neural community types, time sequence versions, statistical types and useful purposes.
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Additional info for Advances in Data Mining and Modeling: Hong Kong 27 - 28 June 2002
In the final DDC model, we often drop certain clusters from a clustering. For example, some leaves in Figure 2 do not have class symbols. These clusters contain few objects in several classes. These are the objects, which are located in the boundaries of other clusters. From our experiment, we found that dropping these clusters from the model can increase the classification accuracy. Table 1 shows four public data sets taken froin the UCI machine learning data repositoryc, which were used to test the DCC models against some other classifiers.
A member of the k-means family) and F the Fastmap algorithm. We summarize the interactive process to build a cluster tree in Figure 3: After we build a cluster tree from the training data set using this process, we have created a sequence of clusterings. In principle, each clustering is a DCC model. Their classification performances are different. Therefore, we use a test data set (or the tuning data set) to identify the best DCC model from a cluster tree. We start from a top level clustering.
Selection of k sets of most effective features from a group of N features. This is a typical combination optimization problem. The total number of combinations is C i . The computation work is gigantic, and it is unrealistic to * The work is supported by the National Natural Science Foundation of China (60175004). 15 16 compare all possible combinations and select the optimized feature sets. In fact, it is impossible because there are thousands over thousands of genes. The simplest way is scoring of each gene based on a certain criterion and filtering away genes with the lowest scores and selecting genes with the highest scores by various mean, such as individual gene-based scoring method [6, 81, mutual information scoring method , Markov Blanket filtering method [lo], etc.