Novel pruning and truncating of the mixture of vine copula clustering models

Abstract

The mixture of the vine copula densities allows selecting the vine structure, the most appropriate type of parametric marginal distributions, and the pair-copulas individually for each cluster. Therefore, complex hidden dependence structures can be fully uncovered and captured by the mixture of vine copula models without restriction to the parametric shape of margins or dependency patterns. However, this flexibility comes with the cost of dramatic increases in the number of model parameters as the dimension increases. Pruning and truncating each cluster of the mixture model will dramatically reduce the number of model parameters. This paper, therefore, introduced the first pruning and truncating techniques for the model-based clustering algorithm using the vine copula model, providing a significant contribution to the state-of-the-art. We apply the proposed methods to a number of well-known data sets with different dimensions. The results show that the performance of the individual pruning and truncation for each model cluster is superior to an existing vine copula clustering model.

Research on ancient glass sub-classification based on clustering models

“…Taking high potassium glass as an example, let the three initial clustering centres of high potassium glass is illustrating in following Equation 6. (6) Define the SSE function for high potassium glass as following Equation 7: (7) Let be the number of iterative steps and calculate the distance as following Equation 8.…”

“…K-means clustering is a popular technique for partitioning a dataset into clusters based on the distance between each data point and the centroid of the cluster. Hierarchical clustering is a technique for creating clusters based on the similarity of data points [7]. Clustering models can be utilized to investigate the relationships between data points and outlier data points, which is aimed to reduce the dimensionality of a dataset and to detect anomalies.…”