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5 results on '"Gaul W"'

1. An EM algorithm for the Student-t Cluster-Weighted Modeling

Author

Gaul, W, Geyer-Schulz, A, Schmidt-Thieme, L, Kunze, J, Ingrassia, S, Minotti, S, Incarbone, G, MINOTTI, SIMONA CATERINA, Incarbone, G., Gaul, W, Geyer-Schulz, A, Schmidt-Thieme, L, Kunze, J, Ingrassia, S, Minotti, S, Incarbone, G, MINOTTI, SIMONA CATERINA, and Incarbone, G.

Abstract

Cluster-Weighted Modeling is a flexible statistical framework for modeling local relationships in heterogeneous populations on the basis of weighted combinations of local models. Besides the traditional approach based on Gaussian assumptions, here we consider Cluster Weighted Modeling based on Student-t distributions. In this paper we present an EM algorithm for parameter estimation in Cluster-Weighted models according to the maximum likelihood approach. © 2012 Springer-Verlag Berlin Heidelberg.

Published
2012

2. A New Version of the Structural Dynamic Model with Unique Latent Scores

Author

Bock, HH, Gaul, W, Vichi, M, Arabie, P, Baier, D, Critchley, F, Decker, R, Diday, E, Greenacre, M, Lauro, C, Meulman, J, Monari, P, Nishisato, S, Ohsumi, N, Opitz, O, Ritter, G, Schader, M, Weihs, C, Mignani, S, Montanari, A, Minotti, S, Vittadini, G, MINOTTI, SIMONA CATERINA, VITTADINI, GIORGIO, Bock, HH, Gaul, W, Vichi, M, Arabie, P, Baier, D, Critchley, F, Decker, R, Diday, E, Greenacre, M, Lauro, C, Meulman, J, Monari, P, Nishisato, S, Ohsumi, N, Opitz, O, Ritter, G, Schader, M, Weihs, C, Mignani, S, Montanari, A, Minotti, S, Vittadini, G, MINOTTI, SIMONA CATERINA, and VITTADINI, GIORGIO

Abstract

The indeterminacy of the Structural Models, i.e. the arbitrariness of latent scores, due to the factorial nature of the measurement models, is, in the dynamic context, more problematic. We propose an alternative formulation of the Structural Dynamic Model, based on the Replicated Common Factor Model (Haagen e Oberhofer, 1999), where latent scores are no more indeterminate.

Published
2005

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