Search results for "62P Applications"

showing 6 items of 6 documents

Bayesian hierarchical models for analysing the spatial distribution of bioclimatic indices

2017

A methodological approach for modelling the spatial distribution of bioclimatic indices is proposed in this paper. The value of the bioclimatic index is modelled with a hierarchical Bayesian model that incorporates both structured and unstructured random effects. Selection of prior distributions is also discussed in order to better incorporate any possible prior knowledge about the parameters that could refer to the particular characteristics of bioclimatic indices. MCMC methods and distributed programming are used to obtain an approximation of the posterior distribution of the parameters and also the posterior predictive distribution of the indices. One main outcome of the proposal is the …

Bioclimatologia:62 Statistics::62M Inference from stochastic processes [Classificació AMS]BioclimatologyBioclimatology geostatistics parallel computation spatial prediction:62 Statistics::62P Applications [Classificació AMS]62F15 62M30 62P10 62P12 86A32Estadística bayesiana:Matemàtiques i estadística::Estadística matemàtica [Àrees temàtiques de la UPC]spatial prediction:62 Statistics::62F Parametric inference [Classificació AMS]geostatistics:86 Geophysics [Classificació AMS]parallel computation
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Automatic regrouping of strata in the goodness-of-fit chi-square test

2019

Pearson’s chi-square test is widely employed in social and health sciences to analyze categorical data and contingency tables. For the test to be valid, the sample size must be large enough to provide a minimum number of expected elements per category. This paper develops functions for regrouping strata automatically no matter where they are located, thus enabling the goodness-of-fit test to be performed within an iterative procedure. The functions are written in Excel VBA (Visual Basic for Applications) and in Mathematica. The usefulness and performance of these functions is illustrated by means of a simulation study and the application to different datasets. Finally, the iterative use of …

Contingency tableComputer scienceContinuous Sample of Working Lives62G10 62P25MathematicaSample (statistics):62 Statistics::62P Applications [Classificació AMS]Visual Basic for ApplicationsEconomiaTest (assessment):62 Statistics::62G Nonparametric inference [Classificació AMS]Goodness of fitFinancesSample size determination:Matemàtiques i estadística::Estadística matemàtica [Àrees temàtiques de la UPC]StatisticsVisual Basic for ApplicationsChi-square testGoodness-of-fit chi-square test statistical software Visual Basic for Applications Mathematica Continuous Sample of Working Livesstatistical softwareGoodness-of-fit chi-square testEconometríaCategorical variable
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Consumo de substancias durante el embarazo y dimensiones de personalidad

2020

Este estudio evalúa los patrones de consumo de substancias durante el embarazo y las dimensiones de personalidad asociadas, en una muestra multicéntrica de 1804 mujeres de población general. En el 2-3 día posparto, completaron una entrevista auto-administrada sobre el consumo de alcohol, tabaco, cafeína, cannabis, cocaína, opiáceos, drogas de diseño, además de variables socio-demográficas, obstétricas/reproductivas, historia psiquiátrica previa, apoyo social durante el embarazo y el cuestionario de personalidad de Eysenck (EPQ-RS). Se generaron modelos de regresión logística múltiple. La prevalencia del consumo fue del 50% (N=909): 40% cafeína, 21% tabaco, 3,5% alcohol, y 0,3 cannabis. Las …

Embarazomedia_common.quotation_subject030508 substance abuseMedicine (miscellaneous)03 medical and health sciencesSocial supportPsychiatric historyPsychoticismmedicinePersonalityPersonalidadmedia_commonCannabisPregnancyExtraversion and introversionbusiness.industryEstadística matemàtica--AplicacionsConsumo de substancias:62 Statistics::62P Applications [Classificació AMS]medicine.diseaseNeuroticismEysenck Personality QuestionnairePsychiatry and Mental healthMathematical statisticsCafeínaTabaco:Matemàtiques i estadística::Estadística matemàtica [Àrees temàtiques de la UPC]0305 other medical sciencebusinessAlcoholClinical psychology
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Bayesian correlated models for assessing the prevalence of viruses in organic and non-organic agroecosystems

2017

Cultivation of horticultural species under organic management has increased in importance in recent years. However, the sustainability of this new production method needs to be supported by scientific research, especially in the field of virology. We studied the prevalence of three important virus diseases in agroecosystems with regard to its management system: organic versus non-organic, with and without greenhouse. Prevalence was assessed by means of a Bayesian correlated binary model which connects the risk of infection of each virus within the same plot and was defined in terms of a logit generalized linear mixed model (GLMM). Model robustness was checked through a sensitivity analysis …

Hellinger distancesensitivity analysisHellinger distance model robustness risk infection sensitivity analysis virus epidemiology:Matemàtiques i estadística::Estadística matemàtica [Àrees temàtiques de la UPC]:62 Statistics::62F Parametric inference [Classificació AMS]:62 Statistics::62J Linear inference regression [Classificació AMS]model robustnessvirus epidemiology:62 Statistics::62P Applications [Classificació AMS]62-07 62F15 62J12 62P10 62P12risk infectionSORT- Statistics and Operations Research Transactions
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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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Empirical analysis of daily cash flow time-series and its implications for forecasting

2019

Usual assumptions on the statistical properties of daily net cash flows include normality, absence of correlation and stationarity. We provide a comprehensive study based on a real-world cash flow data set showing that: (i) the usual assumption of normality, absence of correlation and stationarity hardly appear; (ii) non-linearity is often relevant for forecasting; and (iii) typical data transformations have little impact on linearity and normality. This evidence may lead to consider a more data-driven approach such as time-series forecasting in an attempt to provide cash managers with expert systems in cash management.

cash flowtime-serieseducationStatisticsforecasting:62 Statistics::62P Applications [Classificació AMS]62J02 62J05 62P20EconomiaNon-linearitynon-linearityCash flow:Matemàtiques i estadística::Estadística matemàtica [Àrees temàtiques de la UPC]:62 Statistics::62J Linear inference regression [Classificació AMS]Time-seriesStatistics forecasting cash flow non-linearity time-seriesForecasting
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