Search results for " Statistical"

showing 10 items of 1649 documents

Nonmonotonic Pattern Formation in Three Species Lotka-Volterra System with Colored Noise

2005

A coupled map lattice of generalized Lotka-Volterra equations in the presence of colored multiplicative noise is used to analyze the spatiotemporal evolution of three interacting species: one predator and two preys symmetrically competing each other. The correlation of the species concentration over the grid as a function of time and of the noise intensity is investigated. The presence of noise induces pattern formation, whose dimensions show a nonmonotonic behavior as a function of the noise intensity. The colored noise induces a greater dimension of the patterns with respect to the white noise case and a shift of the maximum of its area towards higher values of the noise intensity.

Population DynamicSettore FIS/02 - Fisica Teorica Modelli E Metodi MatematiciStatistical Mechanics (cond-mat.stat-mech)General MathematicsLotka–Volterra equationsStatistical MechanicGeneral Physics and AstronomyPattern formationFOS: Physical sciencesStatistical Mechanics; Population Dynamics; Noise induced effects; Lotka-Volterra equationsWhite noiseMultiplicative noiseNoiseColoredColors of noiseControl theoryNoise induced effectQuantitative Biology::Populations and EvolutionLotka-Volterra equationsStatistical physicsCondensed Matter - Statistical MechanicsCoupled map latticeMathematics
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A cautionary note on the finite sample behavior of maximal reliability.

2019

Several calls have been made for replacing coefficient α with more contemporary model-based reliability coefficients in psychological research. Under the assumption of unidimensional measurement scales and independent measurement errors, two leading alternatives are composite reliability and maximal reliability. Of these two, the maximal reliability statistic, or equivalently Hancock's H, has received a significant amount of attention in recent years. The difference between composite reliability and maximal reliability is that the former is a reliability index for a scale mean (or unweighted sum), whereas the latter estimates the reliability of a scale score where indicators are weighted di…

PopulationtilastomenetelmätSample (statistics)0504 sociologyBias of an estimatorreliability estimatorsStatisticsHumansPsychologyeducationStatisticcomposite reliabilityMathematicsreliabiliteettieducation.field_of_studyta112Observational errorModels Statistical05 social sciences050401 social sciences methodsEstimatorReproducibility of Resultssample sizemaximal reliabilitySample size determinationTest scoreData Interpretation StatisticalPsychology (miscellaneous)Psychological methods
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Mothers who killed or attempted to kill their child: life circumstances, childhood abuse, and types of killing.

1999

The objectives of the present study were to examine the life circumstances, childhood abuse, and types of homicidal acts of 48 mothers who killed/attempted to kill their children) under age 12 between 1970-96 in Finland. Data on the mothers’ life stresses, psychological problems, and childhood abuse were collected from mental state examination (MSE) reports. The cases were divided into 15 neonaticides and 33 mothers who killed an older child. Childhood abuse was documented in 63% of the mothers’ MSE reports. Qualitative analysis identified neonaticides, joint homicide-suicide attempts, impulsive aggression, psychotic acts, postpartum depression, and abusive acts. Nonlinear principal compone…

Postpartum depressionMalePediatricsmedicine.medical_specialtyHealth (social science)Poison controlMothersCycle of violenceNeonaticideSuicide preventionOccupational safety and healthPathology and Forensic MedicineDepression PostpartumLife Change EventsAge DistributionRisk FactorsInjury preventionmedicineHumansChild AbuseSex DistributionPsychiatryChildFinlandInfant NewbornInfantGeneral Medicinemedicine.diseaseMother-Child RelationsAggressionNonlinear DynamicsChild PreschoolFemalePsychologyFactor Analysis StatisticalHomicideMental Status ScheduleLawPsychosocialViolence and victims
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Research Letter: is neuroticism a risk factor for postpartum depression?

2012

Although the relationship between personality and depressive illness is complex (Shea, 2005), there is empirical evidence that some personality features such as neuroticism, harm avoidance, introversion, dependency, self-criticism or perfectionism are related to depressive illness risk (Gunderson et al. 1999). Moreover, personality traits, especially neuroticism, may explain the increased prevalence of depression among females (Goodwin & Gotlib, 2004). Few studies have explored neuroticism, extraversion and psychoticism as risk factors for depression after an event as stressful as childbirth. Pitt (1968) was the first author to report high scores on neuroticism and low scores on extraversio…

Postpartum depressionNeurotic DisordersDepresión postpartoEvaluación de la personalidad:Named Groups::Persons::Age Groups::Adult::Middle Aged [Medical Subject Headings]medicine.disease_causePersonality Assessment:Analytical Diagnostic and Therapeutic Techniques and Equipment::Investigative Techniques::Epidemiologic Methods::Statistics as Topic::Probability::Risk::Risk Factors [Medical Subject Headings]:Organisms::Eukaryota::Animals::Chordata::Vertebrates::Mammals::Primates::Haplorhini::Catarrhini::Hominidae::Humans [Medical Subject Headings]PregnancyRisk Factors62P ApplicationsBig Five personality traits:Psychiatry and Psychology::Mental Disorders::Neurotic Disorders [Medical Subject Headings]Applied Psychology:Phenomena and Processes::Reproductive and Urinary Physiological Phenomena::Reproductive Physiological Phenomena::Reproductive Physiological Processes::Reproduction::Pregnancy [Medical Subject Headings]education.field_of_studyPerfectionism (psychology)Middle AgedNeuroticismPsychiatry and Mental healthMathematical statistics:Analytical Diagnostic and Therapeutic Techniques and Equipment::Investigative Techniques::Epidemiologic Methods::Statistics as Topic::Models Statistical::Logistic Models [Medical Subject Headings]:Named Groups::Persons::Age Groups::Adolescent [Medical Subject Headings]Harm avoidanceFemaleEstudios de seguimientoPsychology:Psychiatry and Psychology::Behavioral Disciplines and Activities::Personality Assessment [Medical Subject Headings]Factores de riesgoAdultmedicine.medical_specialtyAdolescent:Named Groups::Persons::Age Groups::Adult::Young Adult [Medical Subject Headings]PopulationEstadísticaDepression PostpartumYoung AdultPsychoticismCorrespondence:Analytical Diagnostic and Therapeutic Techniques and Equipment::Investigative Techniques::Epidemiologic Methods::Epidemiologic Study Characteristics as Topic::Epidemiologic Studies::Cohort Studies::Longitudinal Studies::Follow-Up Studies [Medical Subject Headings]medicine:Named Groups::Persons::Age Groups::Adult [Medical Subject Headings]Humans:Psychiatry and Psychology::Behavioral Disciplines and Activities::Psychiatric Status Rating Scales [Medical Subject Headings]Escalas de valoración psiquiátricaPsychiatryeducationPsychiatric Status Rating ScalesExtraversion and introversion:Matemàtiques i estadística::Estadística aplicada::Estadística biosanitària [Àrees temàtiques de la UPC]:Psychiatry and Psychology::Mental Disorders::Mood Disorders::Depressive Disorder::Depression Postpartum [Medical Subject Headings]medicine.diseaseLogistic Models:Check Tags::Female [Medical Subject Headings]Trastornos neuróticosFollow-Up Studies
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The Somatic Symptom Disorder - B Criteria Scale (SSD-12): Factorial structure, validity and population-based norms.

2017

The Somatic Symptom Disorder - B Criteria Scale (SSD-12) assesses the psychological features of DSM-5 Somatic Symptom Disorder (SSD). The present study investigates the dimensionality and psychometric properties in a general population sample and provides norm values.Test dimensionality was evaluated via confirmatory factor analysis and nonparametric item response theory. Correlational analyses and logistic regression models based on related measures (SSS 8, PHQ-2, GAD-2, Health Care Utilization) were used to derive predictive validity. Age and gender specific norms were derived via quantile regression.The SSD-12 has good item characteristics and excellent reliability (Cronbach's α=0.95). C…

Predictive validityAdultMaleAdolescentPsychometricsPopulationPopulationSomatic symptom disorderLogistic regressionCorrelation03 medical and health sciencesYoung Adult0302 clinical medicineCronbach's alphaSurveys and QuestionnairesmedicineHumans030212 general & internal medicineeducationAgededucation.field_of_studyReproducibility of ResultsMiddle Agedmedicine.diseaseConfirmatory factor analysisQuantile regressionPsychiatry and Mental healthClinical PsychologyMedically Unexplained SymptomsFemalePsychologyFactor Analysis Statistical030217 neurology & neurosurgeryClinical psychologyJournal of psychosomatic research
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Separation of Cognitive Impairments in Attention-Deficit/Hyperactivity Disorder Into 2 Familial Factors

2010

Contains fulltext : 89304.pdf (Publisher’s version ) (Open Access) CONTEXT: Attention-deficit/hyperactivity disorder (ADHD) is associated with widespread cognitive impairments, but it is not known whether the apparent multiple impairments share etiological roots or separate etiological pathways exist. A better understanding of the etiological pathways is important for the development of targeted interventions and for identification of suitable intermediate phenotypes for molecular genetic investigations. OBJECTIVES: To determine, by using a multivariate familial factor analysis approach, whether 1 or more familial factors underlie the slow and variable reaction times, impaired response inhi…

ProbandMaleMedizinComorbidityNeuropsychological TestsChoice BehaviorDevelopmental psychology2738 Psychiatry and Mental HealthMOLECULAR-GENETICS0302 clinical medicinePerception and Action [DCN 1]GENETIC INFLUENCES10. No inequalityChildMental Health [NCEBP 9]Cognitive disorderCognition10058 Department of Child and Adolescent PsychiatryPedigreePsychiatry and Mental healthPhenotype1201 Arts and Humanities (miscellaneous)Femalemedicine.symptomPsychologyFunctional Neurogenomics [DCN 2]AdolescentDEFICIT HYPERACTIVITY DISORDERContext (language use)610 Medicine & healthImpulsivityArticleREACTION-TIME PERFORMANCE03 medical and health sciencesArts and Humanities (miscellaneous)medicineReaction TimeAttention deficit hyperactivity disorderHumansINTRA-SUBJECT VARIABILITYFamilyINHIBITORY CONTROLGENOME-WIDE ASSOCIATIONDELAY AVERSIONSiblingsSocial environmentmedicine.diseaseComorbidity030227 psychiatryAttention Deficit Disorder with HyperactivityImpulsive BehaviorRESPONSE VARIABILITYSUSTAINED ATTENTIONCognition DisordersFactor Analysis Statistical030217 neurology & neurosurgery
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The impact of study design and diagnostic approach in a large multi-centre ADHD study: Part 2: Dimensional measures of psychopathology and intelligen…

2011

Contains fulltext : 97437.pdf (Publisher’s version ) (Open Access) BACKGROUND: The International Multi-centre ADHD Genetics (IMAGE) project with 11 participating centres from 7 European countries and Israel has collected a large behavioural and genetic database for present and future research. Behavioural data were collected from 1068 probands with ADHD and 1446 unselected siblings. The aim was to describe and analyse questionnaire data and IQ measures from all probands and siblings. In particular, to investigate the influence of age, gender, family status (proband vs. sibling), informant, and centres on sample homogeneity in psychopathological measures. METHODS: Conners' Questionnaires, St…

ProbandResearch designMale110 012 Social cognition of verbal communicationIntelligencePerception and Actions Mental Health [DCN 1]MedizinSocial Sciencescentre effectsDevelopmental psychology2738 Psychiatry and Mental Health0302 clinical medicinelcsh:PsychiatryMulticenter Studies as Topicsibling designChildATTENTION-DEFICIT/HYPERACTIVITY DISORDERMental DisordersWechsler ScalesWechsler Adult Intelligence Scale10058 Department of Child and Adolescent PsychiatryDiagnostic and Statistical Manual of Mental DisordersPsychiatry and Mental healthPhenotypeConduct disorderResearch DesignRELIABILITYFemaleFamily RelationsPsychologyClinical psychologyPsychopathologyResearch ArticleAdultlcsh:RC435-571DEFICIT HYPERACTIVITY DISORDERTWIN610610 Medicine & health150 000 MR Techniques in Brain Function03 medical and health sciencesmulti-centre studyADHD multi-centre studymedicineCriterion validityAttention deficit hyperactivity disorderHumansADHDGenetic Predisposition to Diseaseddc:610Medizinische Fakultät » Universitätsklinikum Essen » LVR-Klinikum Essen » Klinik für Psychiatrie Psychosomatik und Psychotherapie des Kindes- und JugendaltersSiblingMETAANALYSISFamily HealthPsychiatric Status Rating ScalesCHILD PSYCHIATRIC-PATIENTSSiblingsPARENTmedicine.disease030227 psychiatryAttention Deficit Disorder with HyperactivityCONDUCT DISORDERCRITERION VALIDITY030217 neurology & neurosurgery
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Valence Topological Charge-Transfer Indices for Dipole Moments

2003

Valence topological charge-transfer (CT) indices are applied to the calculation of dipole moments. The dipole moments calculated by algebraic and vector semisums of the CT indices are defined. The combination of the CT indices allows the estimation of the dipole moments. The model is generalized for molecules with heteroatoms. The ability of the indices for the description of the molecular charge distribution is established by comparing them with the dipole moment of the valence-isoelectronic series of benzene and styrene. Two CT indices, μ v e c (vector semisum of vertex-pair dipole moments) and μ V v e c (valence μ v e c ) are proposed. μ v e c and μ V v e c are important for the predicti…

Protein ConformationHeteroatomPharmaceutical ScienceBiochemistryAnalytical ChemistryElectricityComputational chemistryDrug DiscoveryPhysicsvalence topological charge-transfer indexChemistryCharge densityGeneral Medicinemolecular charge distributionCondensed Matter Physicstransdermal drug deliveryChemistry (miscellaneous)Molecular MedicineAtomic physicsInformation SystemsSteric effectsBond dipole momentStatic ElectricityTransition dipole momentBiophysicsElectronsFractal dimensionMolecular physicsBiophysical PhenomenaArticleCatalysislcsh:QD241-441Inorganic Chemistrylcsh:Organic chemistryAtomic orbitalMoleculePhysical and Theoretical ChemistryMolecular BiologyStyreneTopological quantum numberDipole momentModels StatisticalValence (chemistry)Chemical polarityOrganic ChemistryBenzeneModels Theoreticalvalence topological chargetransfer indexElectric dipole momentDipolephenyl alcoholModels ChemicalMoment (physics)Electric dipole transitionMolecules
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Investigation of protein folding by coarse-grained molecular dynamics with the UNRES force field.

2010

Coarse-grained molecular dynamics simulations offer a dramatic extension of the time-scale of simulations compared to all-atom approaches. In this article, we describe the use of the physics-based united-residue (UNRES) force field, developed in our laboratory, in protein-structure simulations. We demonstrate that this force field offers about a 4000-times extension of the simulation time scale; this feature arises both from averaging out the fast-moving degrees of freedom and reduction of the cost of energy and force calculations compared to all-atom approaches with explicit solvent. With massively parallel computers, microsecond folding simulation times of proteins containing about 1000 r…

Protein FoldingStaphylococcus aureusRotationMolecular Dynamics SimulationKinetic energyForce field (chemistry)Protein Structure SecondaryArticleMolecular dynamicsMiceProtein structureBacterial ProteinsComputational chemistryAnimalsStatistical physicsPhysical and Theoretical ChemistryMassively parallelQuantitative Biology::BiomoleculesPrincipal Component AnalysisModels StatisticalChemistryProteinsMicrosecondKineticsBundleSolventsThermodynamicsProtein foldingTranscriptional Elongation FactorsCarrier ProteinsAlgorithmsProtein BindingThe journal of physical chemistry. A
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General Statistical Framework for Quantitative Proteomics by Stable Isotope Labeling

2014

Pedro J. Navarro et al.

ProteomicsSaccharomyces cerevisiae ProteinsProteomeQuantitative proteomicsGene Expressionstable isotope labelingSaccharomyces cerevisiaeyeastOxygen Isotopescomputer.software_genreBiochemistryStatistical powerInterpretation (model theory)statistical analysisStable isotope labeling by amino acids in cell cultureQuantitative proteomicsData MiningModels StatisticalChromatographyChemistryMolecular Sequence AnnotationHydrogen PeroxideGeneral ChemistryVariance (accounting)Isotope LabelingStable Isotope LabelingBiological systemNull hypothesiscomputerData integrationJournal of Proteome Research
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