Search Results for author: Pepa Ramírez-Cobo

Found 6 papers, 0 papers with code

A cost-sensitive constrained Lasso

no code implementations31 Jan 2024 Rafael Blanquero, Emilio Carrizosa, Pepa Ramírez-Cobo, M. Remedios Sillero-Denamiel

The Lasso has become a benchmark data analysis procedure, and numerous variants have been proposed in the literature.

Variable selection for Naïve Bayes classification

no code implementations31 Jan 2024 Rafael Blanquero, Emilio Carrizosa, Pepa Ramírez-Cobo, M. Remedios Sillero-Denamiel

However, features are usually correlated, a fact that violates the Na\"ive Bayes' assumption of conditional independence, and may deteriorate the method's performance.

Classification feature selection +1

Analysis of an aggregate loss model in a Markov renewal regime

no code implementations25 Jan 2024 Pepa Ramírez-Cobo, Emilio Carrizosa, Rosa Elvira Lillo

Given a real operational risk database, the aggregate loss model is estimated by fitting separately the inter-losses times and severities.

Cost-sensitive Feature Selection for Support Vector Machines

no code implementations15 Jan 2024 Sandra Benítez-Peña, Rafael Blanquero, Emilio Carrizosa, Pepa Ramírez-Cobo

The relevance of features in a classification procedure is linked to the fact that misclassifications costs are frequently asymmetric, since false positive and false negative cases may have very different consequences.

Classification feature selection

On support vector machines under a multiple-cost scenario

no code implementations22 Dec 2023 Sandra Benítez-Peña, Rafael Blanquero, Emilio Carrizosa, Pepa Ramírez-Cobo

Such maximal margin hyperplane is obtained by solving a quadratic convex problem with linear constraints and integer variables.

Binary Classification Medical Diagnosis

Cost-sensitive probabilistic predictions for support vector machines

no code implementations9 Oct 2023 Sandra Benítez-Peña, Rafael Blanquero, Emilio Carrizosa, Pepa Ramírez-Cobo

Classification in SVM is based on a score procedure, yielding a deterministic classification rule, which can be transformed into a probabilistic rule (as implemented in off-the-shelf SVM libraries), but is not probabilistic in nature.

Specificity

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