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observation. Practical issues related to the specification of initial values, model-based clustering and discriminant procedure …
Persistent link: https://www.econbiz.de/10010665708
This paper describes a way of constructing an ECM algorithm such that it converges at the rate of the EM algorithm. The approach is motivated by the well known conjugate directions algorithm, and a special case of it is when the parameters corresponding to different CM steps are orthogonal....
Persistent link: https://www.econbiz.de/10004980575
functional objects and also find an optimal subspace for clustering, simultaneously. The method is based on the k-means criterion … for functional data and seeks the subspace that is maximally informative about the clustering structure in the data. An …
Persistent link: https://www.econbiz.de/10010846119
matrices, which in turn provides a clear guideline as to when one can use mixture analysis for clustering high dimensional data. …
Persistent link: https://www.econbiz.de/10010572294
Formulas for estimating sample sizes are presented to provide specified levels of power for tests of significance from a longitudinal design allowing for subject attrition. These formulas are derived for a comparison of two groups in terms of single degree-of-freedom contrasts of population...
Persistent link: https://www.econbiz.de/10010776007
clustering approach into the usual panel data model specification. A case study in the field of R&D variables illustrates the …
Persistent link: https://www.econbiz.de/10005008511
Persistent link: https://www.econbiz.de/10005602931
the Self-Organizing Map (SOM). Through the use of SOM clustering and data visualization can be conducted simultaneously …
Persistent link: https://www.econbiz.de/10011143052
The analysis of high-dimensional data often begins with the identification of lower dimensional subspaces. Principal component analysis is a dimension reduction technique that identifies linear combinations of variables along which most variation occurs or which best “reconstruct” the...
Persistent link: https://www.econbiz.de/10005495240
Persistent link: https://www.econbiz.de/10005395841