4 papers
On average coherence of cyclotomic lattices
Lenny Fukshansky, David Kogan
We introduce maximal and average coherence on lattices by analogy with these notions on frames in Euclidean spaces. Lattices with low coherence can be of interest in signal process…
Covariance-based Dissimilarity Measures Applied to Clustering Wide-sense Stationary Ergodic Processes
Qidi Peng, Nan Rao, Ran Zhao
We introduce a new unsupervised learning problem: clustering wide-sense stationary ergodic stochastic processes. A covariance-based dissimilarity measure together with asymptotical…
Representation Theorems of -trees and Brownian Motions Indexed by -trees
Asuman G. Aksoy, Monariah Al-Ansari, Qidi Peng
We provide a new representation of an -tree by using a special set of metric rays. We have captured the four-point condition from these metric rays and shown an equivale…
A Comparison of Clustering and Missing Data Methods for Health Sciences
Ran Zhao, Deanna Needell, Christopher Johansen +1
In this paper, we compare and analyze clustering methods with missing data in health behavior research. In particular, we propose and analyze the use of compressive sensing's matri…