Model selection - Factbites

Model selection - Factbites
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Topic: Model selection

Note: these results are not from the primary (high quality) database.

In the News (Thu 24 Dec 09)

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	Citebase - Mutation-Selection Balance: Ancestry, Load, and Maximum Principle
		The mutation model is the Kimura 3ST mutation scheme, and the selection scheme is assumed to be invariant under...
		The mutation and selection of regulatory DNA sequences is presented as an ideal model system of molecular evolution where genotype, phenotype, and fitness can be explicitly and independently characterized.
		We study the equilibrium behaviour of a deterministic four-state mutation-selection model as a model for the evolution of a population of nucleotide sequences in sequence space.
	citebase.eprints.org /cgi-bin/citations?id=oai%3AarXiv%2Eorg%3Acond%2Dmat%2F0202432

	Input Variable Feature Selection ActiveX Software Component, C#, Visual Basic,.Net
		The input variable selection used in this component is based on performing a statistical test between each of the input variable(s) and the desired output from the model.
		Input variable selection (IVS) is aimed at determining which input variables are required for a model.
		Input Selection/X is based on the method described in [1], but does not use ICA, and is different in several respects.
	windale.com /inputselectionx.php3?poll_id=4 (1121 words)

	FAQ: Endogeneity versus sample-selection bias
		This is accomplished via Heckman's selection correction model (utilizing either ML estimation, or two-step estimation where in the first stage a probit model is used to predict the probability of union status and in the second-stage, the inverse Mills' ratio (IMR) is included as a regressor).
		Because the entire sample is utilized, there are no sample-selection issues (there may be a sample selection issue to the extent that wages are only observed for employed workers; typically this is only a cause for concern in estimating wage equations for females).
		In general, sample-selection bias refers to problems where the dependent variable is only observed for a restricted, nonrandom sample.
	www.stata.com /support/faqs/stat/bias.html (1378 words)

	BostonSportsHub.com - March Madness
		The fact that Air Force was invited to the tournament with an RPI of 70 shows that the Committee is thinking very differently about the selection process than they have in the past.
		The process by which the NCAA Men's Basketball Tournament Selection Committee chooses the 34 at-large bids (those teams that did not gain automatic entry by winning their conference championship) is not an exact science, but the major selection criteria are as follows:
		Despite the results of my model, I fully expected Indiana to be in the field of 65.
	www.bostonsportshub.com /bubble2.htm (1553 words)

	12.3 Self-Selection Models
		Self-selection or sample selection models are applied when the individuals in the sample are not randomly chosen from the population from which one would like to draw inferences.
		In the prototypical self-selection model, interest centers on estimating the parameters of a regression equation (often labeled ``outcome equation'') from observations on individuals who self-selected into the sample on the basis of a criterion that is correlated with the dependent variable of the outcome equation.
		Formally, the model consists of the following two equations:
	www.quantlet.com /mdstat/scripts/xlg/html/xlghtmlnode71.html (1553 words)

	Selected Self-Organization and the Semiotics of Evolutionary Systems
		Self- organizing systems model the abstract, internal, characteristics of matter, while ES model the existence of, external, selective pressures on populations of varying memory based descriptions of some system.
		The consequence of this fact for biological systems is that natural selection (acting on this form of self-organization) is not free to evolve any organism, but it is constrained by the self-organizing properties of the materiality of the organisms it acts upon _ evolution with both a self-organizing and selection component.
		If reproduction is added to the list of tasks these systems can produce based on their dynamic memories, then we have the ingredients for natural selection: heritable variation and selection.
	informatics.indiana.edu /rocha/ises.html (1553 words)

	GP and MULTIPOINT APPROXIMATION
		The population is then filled with the surviving trees according to fitness proportionate selection.
		In problems of empirical model building, the fitness function shall quantify the difference between the response predicted by the original (complex) model and the approximate (simplified) model.
		One of the main problems in the application of such techniques is the necessity to select a structure of the approximation function.
	www.brad.ac.uk /staff/vtoropov/conf/webconf.htm (1553 words)

	Publications at VRlab
		de Sevin and D. Thalmann, The complexity of testing a motivational model of action selection for virtual humans.
		de Sevin and D. Thalmann, An Affective Model of Action Selection for Virtual Humans, In Proceedings of Agents that Want and Like: Motivational and Emotional Roots of Cognition and Action symposium at the Artificial Intelligence and Social Behaviors 2005 Conference (AISB'05), University of Hertfordshire, Hatfield, England, 2005
		de Sevin and D. Thalmann, A motivational Model of Action Selection for Virtual Humans, In Computer Graphics International (CGI), IEEE Computer SocietyPress, New York, 2005
	vrlab.epfl.ch /Publications/publications_front_index.html (8909 words)

	Oxford Scholarship Online: Development Microeconomics
		A subsequent model uses the fact of asymmetric information between employers and employees that leads to adverse selection to make the high manufacturing wage endogenous.
		Keywords: adverse selection, asymmetric information, economic development, formal sector, Harris-Todaro model, immigrant network, industrialization, informal sector, job search, migration
		Keywords: adverse selection, asymmetric information, economic development, formal sector, Harris–Todaro model, immigrant network, industrialization, informal sector, job search, migration
	www.oxfordscholarship.com /oso/public/content/economicsfinance/0198773714/acprof-0198773714-chapter-5.html (8909 words)

	Darwinism and Developmental Systems
		The advantage of the trait group selection model is that it brings out the underlying unity of the various models for the evolution of cooperation and reveals the whole landscape a few peaks of which had previously poked up through the fog of the group selection debate.
		It is the public face of a substantially revised model of the actual process of natural selection, redefining the causal relationships which ecology and evolutionary biology must seek to model.
		The metaphorical conception that Lewontin criticized is the so-called 'lock and key' model of adaptation.
	www.usyd.edu.au /su/hps/preprints/preprint6/Griffiths.html (13702 words)

	pleiot.html
		In the overdominant model and in the symmetric viability model the strength of apparent stabilizing selection is approximately 1/(2n) that of total selection on the whole phenotype.
		We demonstrate that in mutation (migration)-selection balance models the strength of apparent stabilizing selection is order Vm/Vg.
		``Pleiotropic models of polygenic variation, stabilizing selection, and epistasis.'' Genetics 134: 609-625.
	www.tiem.utk.edu /~gavrila/PAPS/pleiot.html (298 words)

	BioMed Central Full text Entropy-based gene ranking without selection bias for the predictive classification of microarray data
		We have thus used a strategy for gene selection that is based on a saturation profile derived from an exponential approximation of the classification error, as estimated by the two-strata modeling scheme.
		The exponentially decreasing behavior we observed after correcting for selection bias is consistent with recent literature proposing that the relationship between cancer classification accuracy and gene ranking from microarray data may be modeled by a power-law function, also called a Zipf's law [22,25].
		Automatic model selection based on an extension of E-RFE may become of further interest for the integrated treatment of all the phases of the array analysis, including the selection of parameters for data normalization purposes.
	www.biomedcentral.com /1471-2105/4/54 (298 words)

	John Hawks Anthropology Weblog : Selection, nuclear genetic variation, and mtDNA
		Genetic drift in an infinite population: the pseudohitchhiking model.
		Thus, the issue of mtDNA selection cannot be separated from the issue of population expansion.
		Or is its recent pattern of variation in living humans the result of recent selection within the human lineage?
	johnhawks.net /weblog/reviews/neandertals/neandertal_dna/weaver_roseman_2005.html?seemore=y (5234 words)

	Learning and Model-Building
		Therefore, the burden of developing an adequate model is largely on the system itself, which will need to rely on various internal heuristics, combinations of pre-existing components, and subjective selection criteria to efficiently construct models that are likely to work.
		Thus internal variation of the control rules, together with natural selection by the environment eventually results in a workable model.
		This may still appear simple in our model with 27 possible architectures, but it suffices to observe that for more complex organisms there are typically millions of possible perceptions and thousands of possible actions to conclude that the space of possible models or control architectures is absolutely astronomical.
	pespmc1.vub.ac.be /LEARNMOD.html (736 words)

	Catalog Descriptions
		Modern information based techniques and model selection in multivariate analysis, informational tests of significance with multivariate data, multivariate analysis of variance, multivariate regression and variable selection, multisample cluster analysis, common principal component model, factor analysis model, covariance structural models with latent variables, mixture-model cluster analysis.
		Prereq: 564 and 572 or 538, or consent of instructor.
		Political Science 512 Quantitative Political Analysis (3) Methods and techniques in quantitative political analysis: univariate and bivariate statistics.
	stat.bus.utk.edu /igsp/catalog.htm (1714 words)

	Learning and Model-Building
		Therefore, the burden of developing an adequate model is largely on the system itself, which will need to rely on various internal heuristics, combinations of pre-existing components, and subjective selection criteria to efficiently construct models that are likely to work.
		Natural selection of organisms is obviously a quite wasteful method to develop knowledge, although it is responsible for most knowledge that living systems have evolved in their genes.
		This may still appear simple in our model with 27 possible architectures, but it suffices to observe that for more complex organisms there are typically millions of possible perceptions and thousands of possible actions to conclude that the space of possible models or control architectures is absolutely astronomical.
	pespmc1.vub.ac.be /LEARNMOD.html (736 words)

	Variations in the Uninsured
		Fixed effects estimation dramatically improves the reliability of model results by removing variation that, in the absence of fixed effects, might be incorrectly assigned to variables in the model.
		Whether the selection effect is likely to be stronger at the county or the state level is an empirical question on which we have no a priori hypothesis.
		This is consistent with the inference that insurers are sufficiently reassured against the threat of adverse selection by the existence of an uncapped high risk pool that they price their insurance products lower than they otherwise would have.
	www.urban.org /Template.cfm?Section=ByAuthor&NavMenuID=63&template=/TaggedContent/ViewPublication.cfm&PublicationID=6238 (736 words)

	Research Interests
		It is also possible, using this model, to consider the effects of selective differences among allelic classes, and to consider the effects of this type of selection on linked neutral loci.
		Is the model of selection wrong, or has the assumption of equilibrium conditions been violated in some important way?
		The goal of this project is to examine balancing selection under non-equilibrium conditions in more detail, in order to characterize the effects of deviations from equilibrium on allele dynamics and on the gene tree.
	ib.berkeley.edu /labs/slatkin/christina/cam.res.html (563 words)

	Designing Enterprise Applications with the J2EE Platform, Second Edition
		Model API design and model technology selection are both important design considerations.
		Application model API design and technology selection have important implications for an application's complexity, scalability, and software quality.
		Model 1 and Model 2 simply refer to the absence or presence (respectively) of a controller servlet that dispatches requests from the client tier and selects views.
	java.sun.com /blueprints/guidelines/designing_enterprise_applications_2e/web-tier/web-tier5.html (563 words)

	Genetic Algorithms, Tournament Selection, and the Effects of Noise - Miller, Goldberg (ResearchIndex)
		This article develops a model, based on order statistics, that can be used to quantitatively predict the resulting selection pressure of a tournament of a given size.
		Abstract: Tournament selection is a useful and robust selection mechanism commonly used by genetic algorithms.
		The selection pressure of tournament selection directly varies with the tournament size --- the more competitors, the higher the resulting selection pressure.
	citeseer.ist.psu.edu /86198.html (495 words)

	Group Selection Theory: Lessons learned
		Griffing (1967) extended selection theory to take into consideration interactions of genotypes. The conceptual biological model was extended to define the group and the usual model was extended to include not only direct effects of its own genes, but also associate contributions from other genotypes in the group.
		positive selection will reduce rather than increase the mean. This results because a gene which has a positive direct advantage for the individual has a negative associate effect on the group. The prediction of this theory, that individual selection will have a negative impact on the group, is evident from the previous section.
		Competition has a major impact on growth in swine Group selection applied in poultry has been shown to overcome similar problems may be of tremendous benefit to the swine industry.
	mark.asci.ncsu.edu /nsif/01proc/muir.htm (2299 words)

	Database Development in Toxicogenomics: Issues and Efforts
		The gene index will be developed in collaboration with other groups at the EBI and the established model organism databases, forming the basis of database integration.
		The primary focus of the CTD is on marine and aquatic organisms as model systems for human diseases.
		However, because of the relatively poor annotation of expressed genes and sequence tags, particularly in the dog and rat, the interpretation of transcript profiling experiments is challenging.
	ehp.niehs.nih.gov /txg/members/2004/6697/6697.html (2299 words)

	Awadalla Homepage
		We develop and use model-based molecular population genetic approaches with empirical data to infer genome-wide contributions of mutation, recombination, and selection on evolutionary histories, and integrate this with interspecific genome data collected across a variety of species, including a number of important human pathogens.
		In SI, it is clear that frequency-dependent balancing selection is the model of selection and as a result SI is an excellent system to test evolutionary predictions.
		The MHC loci in mammals and the classic self-incompatibility loci (SI) in flowering plants are both examples where balancing selection drives variation to high levels.
	www.cals.ncsu.edu /genetics/awadalla/awadalla.html (576 words)

	Thirty Thousand Feet - Aircraft Models
		Model Airplane Superstore Large selection of hand carved, hand painted mahogany model aircraft from the early days of aviation to the space age.
		Phoenix Model Company A large selection of wood and plastic models in a variety of sizes.
		Collect-Aire Models Specializing in bringing to the modeler and collector the finest in rare, custom made unbuilt model kits of subject matter that is unlikely to be produced by other companies.
	www.thirtythousandfeet.com /models.htm (576 words)

	multinomial logit handicapping
		the tips given by a small selection of tipsters that advertised in national newspapers multinomial logit handicapping to increase his wins at the race track soon grew into an obsession multinomial logit handicapping the selection of tipsters is now a comprehensive list of over 60 professional tipsters
		This serves as the dependent variable for the multinomial logit model.
		I am in no way advocating to drop everything in favour of developing one's own multinomial logit handicapping model - there are many ways to skin the punting...
	www.winning-horsetippingsystem.co.uk /multinomial-logit-handicapping.html (576 words)

	aML Multiprocess Multilevel Modeling
		Outcome types may be mixed and correlated, so that many kinds of structural equation models, selection models, and endogeneity issues may be handled.
		In particular, aML excels in selection models and models with potentially endogenous covariates.
		You may mix and match corresponding model types with correlations at any level and simultaneously estimate a wide class of multiprocess models.
	www.applied-ml.com (576 words)

	Optimizing Top-k Selection Queries over Multimedia Repositories
		selection queries can be viewed, in many cases, as that of evaluating more traditional selection conditions.
		In addition to the differences in the query model, another peculiarity of multimedia repositories is that they may allow access to the attributes of each object only through indexes.
		Furthermore, unlike in the relational model, users may just want the
	csdl.computer.org /comp/trans/tk/2004/08/k0992abs.htm (576 words)

	HANNAN'S RUNWAY MODEL AIRCRAFT BOOKS & THINGS
		a large selection of model airplane books, with the emphasis on scale, free flight and aviation history as well as as a unique selection of videos.
		Some copies of Runway's publication, Model Builders and Their Models have slight corner flaws and have been reduced from $13.95 to $9.95.
		This new paper airplane book features aircraft of the Golden Age and beyond, die cut to reduce construction time.
	www.hrunway.com (371 words)

	Naturally occurring low affinity peptide/MHC class I ligands can mediate negative selection and T cell activation.
		The affinity/avidity model for T cell development postulates that ligands with high affinity for the TCR are efficient in negative selection, whereas those with lower affinity/avidity favor positive selection.
		Thus, the same low affinity ligands that can effect negative selection and, in the case of p2Ca/Kb, the maturation of CD8 single-positive thymocytes can also induce the activation of mature CD8 T cells.
		Naturally occurring low affinity peptide/MHC class I ligands can mediate negative selection and T cell activation.
	www.aegis.com /aidsline/1998/jul/M9871100.html (492 words)

	courses Force Sector Model/Force Continuum - Strategos International - 1-888-569-5444
		Upon completion of the 8-hour Instructor course, each participant will be able to successfully deliver the Use of Force end user training to his or her department based on the Force Sector Model and integrating Boyd’s Cycle as it relates to force selection in conflict situations.
		The Use of Force Policy is based on a graphic model representing the departmentally recognized levels of threat and corresponding levels of reasonable force.
		Upon completion of the 4-hour user course each participant will be able to view, understand, and explain the Force Sector Model as it applies to their agency’s Use of Force Policy.
	www.888lowlight.com /courses_useofforce1.html (492 words)

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In the News (Thu 24 Dec 09)