Missing Values
Mostrando 1-12 de 71 artigos, teses e dissertações.
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1. Simulation and Prediction for a Satellite Temperature Sensors Based on Artificial Neural Network
ABSTRACT: Spacecrafts in space environment are exposed to several kinds of thermal sources such as radiation, albedo and emitted IR from the earth. The thermal control subsystem in spacecraft is used to keep all parts operating within allowable temperature ranges. A failure in one or many temperature sensors could lead to abnormal operation. Consequently, a
J. Aerosp. Technol. Manag.. Publicado em: 26/08/2019
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2. MANNGA: A Robust Method for Gap Filling Meteorological Data
Resumo Este trabalho apresenta o método Mannga (Multiple variables with Artificial Neural Network and Genetic Algorithm), desenvolvido para preencher falhas em dados meteorológicos. A ideia principal é preencher as falhas baseando-se nos valores de outras variáveis meteorológicas medidas no mesmo momento, uma vez que as variáveis meteorológicas possue
Rev. bras. meteorol.. Publicado em: 05/08/2019
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3. Estimation of elemental composition of agricultural soils from West Azerbaijan, Iran, using mid-infrared spectral models
RESUMO A caracterização da composição elementar fornece informações úteis para caracterizar o grau de alteração dos solos. Em Miandoab, norte do Irã, esta caracterização não existe. Os objetivos deste trabalho foram avaliar o grau de intemperismo dos solos típicos da região usando a sua composição elementar e estimar esta composição usando
Rev. bras. eng. agríc. ambient.. Publicado em: 01/07/2019
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4. Valores anômalos e dados faltantes em estudos clínicos e experimentais
Resumo Durante a análise dos dados de uma pesquisa científica, é habitual deparar-se com valores anômalos ou dados faltantes. Valores anômalos podem ser resultado de erros de registro, de digitação, de aferição instrumental, ou configurarem verdadeiros outliers. Nesta revisão, são discutidos conceitos, exemplos e formas de identificar e de lidar c
J. vasc. bras.. Publicado em: 30/05/2019
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5. Adaptation of fear of missing out scale (FoMOs): Turkish version validity and reliability study
Abstract Background: The aim of this study is to examine psychometric properties of the Turkish version of the fear of missing out scale (FoMOs) on three different study groups. Method: We conducted the construct validity of the Turkish FoMOs with confirmatory factor analysis, measurement invariance (study I; n = 354), and concurrent validity (study II; n
Psicol. Reflex. Crit.. Publicado em: 18/02/2019
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6. Are Hofstede’s and Schwartz’s values frameworks equally predictive across contexts?
Resumo Objetivo: Este estudo utiliza as dimensões culturais bipolares (ou seja, as estruturas de valores de Hofstede e Schwartz) para prever o comércio entre países e o comportamento de consumo. Metodologia: A análise contida neste artigo foi baseada em dados secundários. Consequentemente, faltaram alguns dados, o que limitou o número de países que
Rev. bras. gest. neg.. Publicado em: 2019-01
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7. Periodontal parameters in prediabetes, type 2 diabetes mellitus, and non-diabetic patients
Abstract The aim of the present study was to compare the clinical and radiographic periodontal parameters in prediabetes, type 2 diabetes mellitus (T2DM), and non-diabetic patients. Forty-one patients with prediabetes (Group 1), 43 patients with T2DM (Group 2), and 41 controls (Group 3) were included. Demographic data were recorded using a questionnaire. Ful
Braz. oral res.. Publicado em: 06/08/2018
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8. The impact of nonsyndromic cleft lip with or without cleft palate on oral health-related quality of life
Abstract Nonsyndromic cleft lip with or without cleft palate (NSCL±P) compromises oral health, leading to missing or malformed teeth, and hampering oral hygiene. Apart from anatomic damages, NSCL±P also culminates in an impact on the routine quality of life with social privation and psychological embarrassment. Objective To evaluate the impact of NSCL±P
J. Appl. Oral Sci.. Publicado em: 05/04/2018
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9. Oral health assessment for users of marijuana and cocaine/crack substances
Abstract: The objective of this study was to assess the oral health status of users of illicit drugs such as marijuana and cocaine/crack and compare it with individuals not using these chemical substances. Questionnaires were applied to 35 illicit drugs users to gather information on demographic status, general health, and use of drugs. Then, a clinical asse
Braz. oral res.. Publicado em: 18/12/2017
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10. Missing value imputation in multi-environment trials: Reconsidering the Krzanowski method
Abstract We propose a new methodology for multiple imputation when faced with missing data in multi-environmental trials with genotype-by-environment interaction, based on the imputation system developed by Krzanowski that uses the singular value decomposition (SVD) of a matrix. Several different iterative variants are described; differential weights can als
Crop Breed. Appl. Biotechnol.. Publicado em: 2016-06
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11. Validity and reliability of the quality of masticatory function questionnaire applied in Brazilian adolescents
ABSTRACT Purpose proper chewing and swallowing functions have great importance in general health, since it potentially affects food’s digestion and the subject’s nutritional status. The aim was to assess the validity and reliability of the self-applied Quality of Masticatory Function Questionnaire (QMFQ) in a convenience (non-referred) sample of Brazili
CoDAS. Publicado em: 2016-04
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12. The influence of glycemic control on the oral health of children and adolescents with diabetes mellitus type 1
ABSTRACT Objective To evaluate the influence of disease control, expressed by the mean values of glycated hemoglobin (HbA1c), in the oral health of children and adolescents with diabetes mellitus type 1 (T1DM). Subjects and methods A cross sectional study involving 87 children and adolescents (59 girls), 10 ± 2.6 years old. The participants were divided
Arch. Endocrinol. Metab.. Publicado em: 2015-12