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Over the last few years many methods have been developed for analyzing functional data with different objectives. The purpose of this paper is to predict a binary response variable in terms of a functional variable whose sample information is given by a set of curves measured without error. In order to solve this problem we formulate a functional logistic… (More)

- M. Escabiasy, A. M. Aguilera, M. J. Valderrama
- 2004

SUMMARY In recent years, many studies have dealt with predicting a response variable based on the information provided by a functional variable. When the response variable is binary, different problems arise, such as multicollinearity and high dimensionality, which prejudice the estimation of the model and the interpretation of its parameters. In this… (More)

- ANA M. AGUILERA, FRANCISCO A. OCAN, MARIANO J. VALDERRAMA
- 1997

SUMMARY In this paper, a linear model for forecasting a continuous-time stochastic process in a future interval in terms of its evolution in a past interval is developed. This model is based on linear regression of the principal components in the future against the principal components in the past. In order to approximate the principal factors from discrete… (More)

- Jesús Navarro-Moreno, Juan Carlos Ruiz-Molina, Mariano J. Valderrama
- IEEE Trans. Information Theory
- 2000

- G Giménez-Jurado, M J Valderrama, I Sá-Nogueira, I Spencer-Martins
- Antonie van Leeuwenhoek
- 1995

The taxonomy of the yeast genus Metschnikowia has undergone profound changes over the past century. Major developments, from the capacity to obtain pure cultures of parasitic species to progress associated with the extensive use of molecular biology tools in yeast systematics, are briefly reviewed. Results from past work and new data are combined to… (More)

- A Valero, M I Paniagua, +4 authors F J Adroher
- Parasitology international
- 2006

An epidemiological survey of anisakids was carried out on 209 specimens of greater forkbeard (Phycis blennoides) and 58 of forkbeard (Phycis phycis) captured off the Mediterranean coasts of Andalucía (southern Spain). Four species of nematodes were identified: Anisakis simplex s.l., Anisakis physeteris, Hysterothylacium aduncum and Hysterothylacium fabri.… (More)

- Ana M. Aguilera, Manuel Escabias, Mariano J. Valderrama
- Computational Statistics & Data Analysis
- 2006

The logistic regression model is used to predict a binary response variable in terms of a set of explicative ones. The estimation of the model parameters is not too accurate and their interpretation in terms of odds ratios may be erroneous, when there is multicollinearity (high dependence) among the predictors. Other important problem is the great number of… (More)

- M J Valderrama, M Monteoliva-Sanchez, E Quesada, A Ramos-Cormenzana
- Research in microbiology
- 1998

The cellular fatty acid composition of Halomonas salina, a moderately halophilic bacterium grown at different salt concentrations, is reported. Fatty acids C16:0 and C18:1 were major components and significant amounts of C16:1, C18:0 and cyc-C19:0 were also detected. The results showed clear chemotaxonomic relationships with recognized members of the genus… (More)

- F. A. Ocan, M. J. Valderrama
- 1998

The functional principal components analysis (PCA) involves new considerations on the mechanism of measuring distances (the norm). Some properties arising in functional framework (e.g., smoothing) could be taken into account through an inner product in the data space. But this proposed inner product could make, for example, interpretational or (and)… (More)

- Manuel Escabias, Ana M. Aguilera, Mariano J. Valderrama
- Computational Statistics & Data Analysis
- 2007

Functional logistic regression has been developed to forecast a binary response variable from a functional predictor. In order to fit this model, it is usual to assume that the functional observations and the parameter function of the model belong to a same finite space generated by a basis of functions. This consideration turns the functional model into a… (More)