Search results for "METHODOLOGIE"
showing 10 items of 2141 documents
More Power through Symbolic Computation: Extending Stata by using the Maxima Computer algebra system
2015
Maxima is a free and open-source computer algebra system that can perform symbolic computations such as solving equations, determining derivatives of functions, obtaining Taylor series, and manipulating algebraic expressions. In this article, I present the Maxima Bridge System, which is a collection of software programs that allows Stata to interface with Maxima so that Maxima can be used for symbolic computation to transfer data from Stata to Maxima and to retrieve results from Maxima. The cooperation between Stata and Maxima provides an environment for statistical analysis in which symbolic computation can be easily used together with all the facilities supplied by Stata. In this environ…
Representations for evolutionary algorithms
2015
Successful and efficient use of evolutionary algorithms (EA) depends on the choice of the genotype, the problem representation (mapping from genotype to phenotype) and on the choice of search operators that are applied to the genotypes. These choices cannot be made independently of each other. The question whether a certain representation leads to better performing EAs than an alternative representation can only be answered when the operators applied are taken into consideration. The reverse is also true: deciding between alternative operators is only meaningful for a given representation. In EA practice one can distinguish two complementary approaches. The first approach uses indirect repr…
High Locality Representations for Automated Programming
2011
We study the locality of the genotype-phenotype mapping used in grammatical evolution (GE). GE is a variant of genetic programming that can evolve complete programs in an arbitrary language using a variable-length binary string. In contrast to standard GP, which applies search operators directly to phenotypes, GE uses an additional mapping and applies search operators to binary genotypes. Therefore, there is a large semantic gap between genotypes (binary strings) and phenotypes (programs or expressions). The case study shows that the mapping used in GE has low locality leading to low performance of standard mutation operators. The study at hand is an example of how basic design principles o…
On the use of neighbourhood-based non-parametric classifiers
1997
Alternative non-parametric classification schemes, which come from the use of different definitions of neighbourhood, are introduced. In particular, the Nearest Centroid Neighbourhood along with the neighbourhood relation derived from the Gabriel Graph and the Relative Neighbourhood Graph are used to define the corresponding (k-)Nearest Neighbour-like classifiers. Experimental results are reported to compare the performance of the approaches proposed here to the one obtained with the k-Nearest Neighbours rule.
Lógicas epistémicas y sistemas multiagentes: los agentes nacen y mueren
2008
In this paper we study the propositional epistemic logics with operators to analize the knowledge of a group, and its applications to the multi-agent systems when the number of agents can vary between different worlds or states.
MOESM2 of Global mapping of randomised trials related articles published in high-impact-factor medical journals: a cross-sectional analysis
2020
Additional file 2. Data extraction and normalisation processes.
MOESM2 of Global mapping of randomised trials related articles published in high-impact-factor medical journals: a cross-sectional analysis
2020
Additional file 2. Data extraction and normalisation processes.
Negative results in the theory of games with lexicographic utilities
2003
When players may have lexicographic utilities, there are: (i) extensive games having a non-empty set of equilibria but empty sets of sequentially rational, sequential and perfect equilibria (ii) normal form games having a non-empty set of equilibria but an empty set of proper equilibria and no stable set of equilibria and (iii) two extensive games having the same normal form representation and disjoint sets of sequential equilibria.
Additional file 4 of Are small protected habitat patches within boreal production forests effective in conserving species richness, abundance and com…
2021
Additional file 4. Search strings. Full search strings in English and Russian, and simplified search strings for Google and Google Scholar in English, Russian, Swedish and Finnish.
Additional file 2 of Efficacy and acceptability of pharmacological and non-pharmacological interventions for non-specific chronic low back pain: a pr…
2020
Additional file 2. MEDLINE search string.