Zobrazeno 1 - 10
of 52
pro vyhledávání: '"Gunter Ritter"'
Publikováno v:
Proceedings of the Water Environment Federation. 2018:4064-4077
Autor:
Gunter Ritter, María Teresa Gallegos
Publikováno v:
Advances in Data Analysis and Classification. 12:179-202
The present paper proposes a new strategy for probabilistic (often called model-based) clustering. It is well known that local maxima of mixture likelihoods can be used to partition an underlying data set. However, local maxima are rarely unique. The
Autor:
Gunter Ritter, María Teresa Gallegos
Publikováno v:
Journal of Multivariate Analysis. 117:14-31
Pollard showed for k-means clustering and a very broad class of sampling distributions that the optimal cluster means converge to the solution of the related population criterion as the size of the data set increases. We extend this consistency resul
Autor:
María Teresa Gallegos, Gunter Ritter
Publikováno v:
Computational Statistics & Data Analysis. 54:637-654
Statistical clustering criteria with free scale parameters and unknown cluster sizes are inclined to create small, spurious clusters. To mitigate this tendency a statistical model for cardinality-constrained clustering of data with gross outliers is
Autor:
María Teresa Gallegos, Gunter Ritter
Publikováno v:
Advances in Data Analysis and Classification. 3:135-167
We establish an affine equivariant, constrained heteroscedastic model and criterion with trimming for clustering contaminated, grouped data. We show existence of the maximum likelihood estimator, propose a method for determining an appropriate constr
Autor:
Gunter Ritter
Clustering remains a vibrant area of research in statistics. Although there are many books on this topic, there are relatively few that are well founded in the theoretical aspects. This book presents an overview of the theory and applications of prob
Autor:
Le Gao, Gunter Ritter
Publikováno v:
Pattern Recognition. 41:38-55
We treat the problem of chromosome segmentation with the aid of shape analysis and classification. Our approach consists of a combination of two phases, a purely rule-based phase and a phase driven by constrained discriminant analysis. In the first p
Autor:
K. P. Jungius, N. Rupp, María Teresa Gallegos, Gunter Ritter, Ernst-Michael Jung, Dirk-André Clevert, R. Kubale
Publikováno v:
European Radiology. 17:439-447
The purpose was to evaluate whether B-flow can improve the ultrasonographic diagnosis of preocclusive stenosis and occlusion of the internal carotid artery (ICA) compared with colour-coded Doppler and power Doppler. Ninety patients with occlusions or
Autor:
Gunter Ritter, María Teresa Gallegos
Publikováno v:
Journal of Multivariate Analysis. 97(5):1221-1250
Recently, we proposed variants as a statistical model for treating ambiguity. If data are extracted from an object with a machine then it might not be able to give a unique safe answer due to ambiguity about the correct interpretation of the object.
This volume contains both methodological papers showing new original methods, and papers on applications illustrating how new domain-specific knowledge can be made available from data by clever use of data analysis methods.