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- Stefan Todorov Hadjitodorov, Ludmila I. Kuncheva, Ludmila P. Todorova
- Information Fusion
- 2006

Adjusted Rand index is used to measure diversity in cluster ensembles and a diversity measure is subsequently proposed. Although the measure was found to be related to the quality of the ensemble, this relationship appeared to be non-monotonic. In some cases, ensembles which exhibited a moderate level of diversity gave a more accurate clustering. Based on… (More)

The pairwise approach to cluster ensembles uses multiple partitions, each of which constructs a coincidence matrix between all pairs of objects. The matrices for the partitions are then combined and a final clustering is derived thereof. Here we study the diversity within such cluster ensembles. Based on this, we propose a variant of the generic ensemble… (More)

- Ludmila I. Kuncheva, Stefan Todorov Hadjitodorov, Ludmila P. Todorova
- 2006 9th International Conference on Information…
- 2006

Cluster ensembles are deemed to be a robust and accurate alternative to single clustering runs. 24 methods for designing cluster ensembles are compared here using 24 data sets, both artificial and real. Adjusted rand index and classification accuracy are used as accuracy criteria with respect to a known partition assumed to be the "true" one. The data sets… (More)

- Stefan Hadjitodorov, Petar Mitev
- Medical engineering & physics
- 2002

A system for acoustic analysis of pathological voices is proposed. The vocalized part of the voice signal is separated and all glottal cycles are traced by means of a cross-correlation detector. Based on the so determined beginning and duration of all glottal cycles, shimmer, jitter, several harmonics-to-noise ratios and other widely used acoustic… (More)

- Stefan Todorov Hadjitodorov, B. Boyanov, B. Teston
- IEEE Transactions on Information Technology in…
- 2000

Most of the existing systems and methods for laryngeal pathology detection are characterized by a classification error. One of the basic problems is the approximation and estimation of the probability density functions of the given classes. In order to increase the accuracy of laryngeal pathology detection and to eliminate the most dangerous error… (More)

- Ivan Nestorov, Malcolm Rowland, S. T. Hadjitodorov, I. Petrov
- AAPS PharmSci
- 1999

The aim of the current study was to compare the predictive performance of a mechanistically based model and an empirical artificial neural network (ANN) model to describe the relationship between the tissue-to-unbound plasma concentration ratios (Kpu's) of 14 rat tissues and the lipophilicity (LogP) of a series of nine 5-n-alkyl-5-ethyl barbituric acids.… (More)

Cluster ensembles are deemed to be better than single clustering algorithms for discovering complex or noisy structures in data. Various heuristics for constructing such ensembles have been examined in the literature, e.g., random feature selection, weak clusterers, random projections, etc. Typically, one heuristic is picked at a time to construct the… (More)

- Petar Mitev, Stefan Todorov Hadjitodorov
- Inf. Sci.
- 2003

- Vesselin Kissiov, Stefan Todorov Hadjitodorov, Ludmila I. Kuncheva
- Pattern Recognition Letters
- 1990

- Stefan Todorov Hadjitodorov, B. Boyanov, N. Dalakchieva
- Speech Communication
- 1997