Friendship of Stock Market Indices: A Cluster-Based Investigation of Stock Markets

László Nagy, Mihály Ormos
2018 Journal of Risk and Financial Management  
This paper introduces a spectral clustering-based method to show that stock prices contain not only firm but also network-level information. We cluster different stock indices and reconstruct the equity index graph from historical daily closing prices. We show that tail events have a minor effect on the equity index structure. Moreover, covariance and Shannon entropy do not provide enough information about the network. However, Gaussian clusters can explain a substantial part of the total
more » ... ce. In addition, cluster-wise regressions provide significant and stationer results.
doi:10.3390/jrfm11040088 fatcat:j7hkk4kokfbhxjkvwpnotvhlqi