نتایج جستجو برای: local linear model tree lolimot

تعداد نتایج: 2979335  

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There are numerous methods to estimate missing values of which some are used depending on the data type and regional climatic characteristics. In this research, part of the monthly precipitation data in Sarab synoptic station, east Azerbaijan province, Iran was randomly considered missing values. In order to study the effectiveness of various methods to estimate missing data, by seven classic s...

Journal: :Ecography 2015
Diego Nieto-Lugilde Jonathan Lenoir Sylvain Abdulhak David Aeschimann Stefan Dullinger Jean-Claude Gégout Antoine Guisan Harald Pauli Julien Renaud Jean-Paul Theurillat Wilfried Thuiller Jérémie Van Es Pascal Vittoz Wolfgang Willner Thomas Wohlgemuth Niklaus E Zimmermann Jens-Christian Svenning

The role of competition for light among plants has long been recognised at local scales, but its importance for plant species distributions at larger spatial scales has generally been ignored. Tree cover modifies the local abiotic conditions below the canopy, notably by reducing light availability, and thus, also the performance of species that are not adapted to low-light conditions. However, ...

2003
Wilfried Thuiller Miguel B. Lavorel Araújo

Statistical models of the realized niche of species are increasingly used, but systematic comparisons of alternative methods are still limited. In particular, only few studies have explored the effect of scale in model outputs. In this paper, we investigate the predictive ability of three statistical methods (generalized linear models, generalized additive models and classification tree analysi...

2002
I Gusti Ngurah Darmawan John P. Keeves

Recent advance in information technology has aroused much interest among policy-makers, the business sector, the media and the academic world in developed countries. However, very little is known about the obstacles to adopting information technology in developing countries, particularly the low-income economies. This research stems from the issues described above. A variety of factors may infl...

2010
Fabio Parisini

Local branching is a general purpose heuristic method which searches locally around the best known solution by employing tree search. It has been successfully used in Mixed Integer Programming (MIP) where local branching constraints are used to model the neighborhood of an incumbent solution and improve the bound. The neighborhoods are obtained by linear inequalities in the MIP model so that MI...

2011
Martin Atzmueller Andreas Hotho Annalisa Appice Michelangelo Ceci Donato Malerba Antonietta Lanza Anna Ciampi Angelo Muolo Stephan Doerfel Folke Mitzlaff Gerd Stumme Padraig Cunningham Zaigham Faraz Siddiqui Myra Spiliopoulou Panagiotis Symeonidis Eleftherios Tiakas

Despite the growing ubiquity of sensor deployments and the advances in sensor data analysis technology, relatively little attention has been paid to the spatial non-stationarity of sensed data which is an intrinsic property of the geographically distributed data. In this paper we deal with non-stationarity of geographically distributed data for the task of regression. At this purpose, we extend...

2011
Annalisa Appice Michelangelo Ceci Donato Malerba Antonietta Lanza

The Geographically Weighted Regression (GWR) is a method of spatial statistical analysis which allows the exploration of geographical differences in the linear effect of one or more predictor variables upon a response variable. The parameters of this linear regression model are locally determined for every point of the space by processing a sample of distance decay weighted neighboring observat...

2009
Hany Hassan Khalil Sima'an Andy Way

Recent syntactic extensions of statistical translation models work with a synchronous context-free or tree-substitution grammar extracted from an automatically parsed parallel corpus. The decoders accompanying these extensions typically exceed quadratic time complexity. This paper extends the Direct Translation Model 2 (DTM2) with syntax while maintaining linear-time decoding. We employ a linea...

Journal: :Electronic Notes in Discrete Mathematics 2009
Youssou Dieng Cyril Gavoille

We prove that every planar graph G of tree-length has a tree-decomposition for which every bag is the union of at most 10 shortest paths of length O( ). As a consequence, the tree-width of G is bounded by O( ), generalizing the linear local tree-width result of planar graphs, since the tree-length of a graph does not exceed its diameter. Such a tree-decomposition can be computed in polynomial t...

2004
Zhaohui Sun Jitender S. Deogun

Probabilistic suffix tree (PST) is a stochastic model that uses a suffix tree as an index structure to store conditional probabilities associated with subsequences. PST has been successfully used to model and predict protein families following global approach. Their approach takes into account the entire sequence, and thus is not suitable for partially conserved families. We develop two variant...

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