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Geographically weighted regression

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https://www.readbyqxmd.com/read/28444001/birth-weight-and-risk-of-childhood-solid-tumors-in-brazil-a-record-linkage-between-population-based-data-sets
#1
Neimar de Paula Silva, Rejane de Souza Reis, Rafael Garcia Cunha, Julio Fernando Oliveira, Fernanda Cristina da Silva de Lima, Maria Socorro Pombo-de-Oliveira, Marceli Oliveira Santos, Beatriz de Camargo
Objective: To analyze the relationship between the development of childhood solid tumors and 1) birth weight and 2) fetal growth, using two Brazilian population-based data sets. Methods: A case-cohort study was performed using two population-based data sets, and linkage between the Live Birth Information System (Sistema de Informação sobre Nascidos Vivos, SINASC) and 14 population-based cancer registries (PBCRs) was established. Four controls per case were chosen randomly from the SINASC data set...
April 20, 2017: Revista Panamericana de Salud Pública, Pan American Journal of Public Health
https://www.readbyqxmd.com/read/28441467/distribution-of-mammal-functional-diversity-in-the-neotropical-realm-influence-of-land-use-and-extinction-risk
#2
José F González-Maya, Enrique Martínez-Meyer, Rodrigo Medellín, Gerardo Ceballos
Functional diversity represents a measure of diversity that incorporates the role of species in an ecosystem, and therefore its dynamics and resilience. Assessing its drivers and spatial variation represents an important step forward in our understanding of functional ecosystem dynamics and it is also necessary to achieve a comprehensive conservation planning. In this paper, we assessed mammal functional diversity for the 218 ecoregions within the Neotropical realm. We evaluated the overall influence and spatial variation of species richness, ecoregion extent, intervention and species at risk on functional diversity...
2017: PloS One
https://www.readbyqxmd.com/read/28427355/identifying-and-characterizing-hepatitis-c-virus-hotspots-in-massachusetts-a-spatial-epidemiological-approach
#3
Thomas J Stopka, Michael A Goulart, David J Meyers, Marga Hutcheson, Kerri Barton, Shauna Onofrey, Daniel Church, Ashley Donahue, Kenneth K H Chui
BACKGROUND: Hepatitis C virus (HCV) infections have increased during the past decade but little is known about geographic clustering patterns. METHODS: We used a unique analytical approach, combining geographic information systems (GIS), spatial epidemiology, and statistical modeling to identify and characterize HCV hotspots, statistically significant clusters of census tracts with elevated HCV counts and rates. We compiled sociodemographic and HCV surveillance data (n = 99,780 cases) for Massachusetts census tracts (n = 1464) from 2002 to 2013...
April 20, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28425896/a-longitudinal-cohort-study-examining-determinants-of-overweight-and-obesity-in-adulthood
#4
Caroline Barakat-Haddad, Usman Saeed, Susan Elliott
OBJECTIVES: Adulthood overweight and obesity are multifaceted conditions influenced by a combination of biological, environmental and socio-cultural factors across the lifespan. Using a longitudinal study design, we aimed to identify determinants of adulthood overweight and obesity, in relation to: 1) childhood and life course factors, 2) geographical differences in air quality, and 3) gender-specific factors, in a cohort followed from childhood into adulthood. METHODS: Childhood data were acquired (1978-1986) from children residing in four distinct Hamilton neighbourhoods (Ontario, Canada), including air-quality assessments...
April 20, 2017: Canadian Journal of Public Health. Revue Canadienne de Santé Publique
https://www.readbyqxmd.com/read/28419683/geographical-differences-in-survival-of-dogs-with-non-hodgkin-lymphoma-treated-with-a-chop-based-chemotherapy-protocol
#5
H Wilson-Robles, C M Budke, T Miller, N Dervisis, A Novosad, Z Wright, D H Thamm, K Vickery, K Burgess, M Childress, J Lori, C Saba, S Rau, M Silver, G Post, K Reeds, S Gillings, S Schleis, T Stein, B Brugmann, C DeRegis, O Smrkovski, J Lawrence, T Laver
BACKGROUND: In humans geographical differences in the incidence and presentation of various cancers have been reported. However, much of this information has not been collected in veterinary oncology. AIM: The purpose of this study was to determine if a geographic difference in progression free survival exists for dogs with lymphoma treated within the US. MATERIALS AND METHODS: Medical records of 775 cases of canine lymphoma from 3 US regions (west, south and north), treated with CHOP chemotherapy, were retrospectively evaluated...
April 17, 2017: Veterinary and Comparative Oncology
https://www.readbyqxmd.com/read/28415846/is-urban-rural-location-associated-with-weight-status-in-school-children-an-examination-of-42-small-and-rural-californian-counties
#6
Ron Strochlic, Lauren E Au, Lorrene Ritchie
INTRODUCTON: Studies have identified geographic variation in overweight and obesity rates among children, with higher rates of overweight and obesity often found among children living in rural compared to urban areas. A small number of studies have explored differences in overweight and obesity based on more nuanced gradations along the urban-rural continuum. The purpose of the present study was to identify differences in overweight and obesity based on gradations along the urban-rural continuum among children in 42 Californian counties with populations less than 500 000...
April 2017: Rural and Remote Health
https://www.readbyqxmd.com/read/28403888/the-relationship-between-ethnic-composition-of-the-residential-environment-and-self-reported-health-among-turks-and-moroccans-in-amsterdam
#7
Eleonore M Veldhuizen, Umar Z Ikram, Sjoerd de Vos, Anton E Kunst
BACKGROUND: Previous studies from the US and UK suggest that neighbourhood ethnic composition is associated with health, positive or negative, depending on the health outcome and ethnic group. We examined the association between neighbourhood ethnic composition and self-reported health in these groups in Amsterdam, and we aimed to explore whether there is spatial variation in this association. METHODS: We used micro-scale data to describe the ethnic composition in buffers around the home location of 2701 Turks and 2661 Moroccans...
April 12, 2017: International Journal of Health Geographics
https://www.readbyqxmd.com/read/28397745/modeling-fire-occurrence-at-the-city-scale-a-comparison-between-geographically-weighted-regression-and-global-linear-regression
#8
Chao Song, Mei-Po Kwan, Jiping Zhu
An increasing number of fires are occurring with the rapid development of cities, resulting in increased risk for human beings and the environment. This study compares geographically weighted regression-based models, including geographically weighted regression (GWR) and geographically and temporally weighted regression (GTWR), which integrates spatial and temporal effects and global linear regression models (LM) for modeling fire risk at the city scale. The results show that the road density and the spatial distribution of enterprises have the strongest influences on fire risk, which implies that we should focus on areas where roads and enterprises are densely clustered...
April 8, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28391146/a-new-approach-to-spatial-identification-of-potential-health-hazards-associated-with-childhood-asthma
#9
Alina Svechkina, Boris A Portnov
RESEARCH BACKGROUND: Childhood asthma is a chronic disease, known to be linked to prolonged exposure to air pollution. However, the identification of specific health hazards, associated with childhood asthma is not always straightforward, due to the presence of multiple sources of air pollution in urban areas. In this study, we test a novel approach to the spatial identification of environmental hazards that have the highest probability of association with the observed asthma morbidity patterns...
April 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28373741/climatic-conditions-and-human-mortality-spatial-and-regional-variation-in-the-united-states
#10
Tse-Chuan Yang, Leif Jensen
Previous research on climatic conditions and human mortality in the United States has three gaps: largely ignoring social conditions, lack of nationwide focus, and overlooking potential spatial variations. Our goal is to understand whether climatic conditions contribute to mortality after considering social conditions and to investigate whether spatial non-stationarity exists in these factors. Applying geographically weighted regression to a unique nationwide county-level dataset, we found that (1) net of other factors, average July temperatures are positively (detrimentally) associated with mortality while January temperatures mainly have a curvilinear relationship, (2) the mortality-climatic condition associations are spatially non-stationary, (3) the relationships between social conditions (e...
March 2017: Population and Environment
https://www.readbyqxmd.com/read/28367364/a-comparison-of-least-squares-regression-and-geographically-weighted-regression-modeling-of-west-nile-virus-risk-based-on-environmental-parameters
#11
Abhishek K Kala, Chetan Tiwari, Armin R Mikler, Samuel F Atkinson
BACKGROUND: The primary aim of the study reported here was to determine the effectiveness of utilizing local spatial variations in environmental data to uncover the statistical relationships between West Nile Virus (WNV) risk and environmental factors. Because least squares regression methods do not account for spatial autocorrelation and non-stationarity of the type of spatial data analyzed for studies that explore the relationship between WNV and environmental determinants, we hypothesized that a geographically weighted regression model would help us better understand how environmental factors are related to WNV risk patterns without the confounding effects of spatial non-stationarity...
2017: PeerJ
https://www.readbyqxmd.com/read/28359282/a-modification-to-geographically-weighted-regression
#12
Yin-Yee Leong, Jack C Yue
BACKGROUND: Geographically weighted regression (GWR) is a modelling technique designed to deal with spatial non-stationarity, e.g., the mean values vary by locations. It has been widely used as a visualization tool to explore the patterns of spatial data. However, the GWR tends to produce unsmooth surfaces when the mean parameters have considerable variations, partly due to that all parameter estimates are derived from a fixed- range (bandwidth) of observations. In order to deal with the varying bandwidth problem, this paper proposes an alternative approach, namely Conditional geographically weighted regression (CGWR)...
March 31, 2017: International Journal of Health Geographics
https://www.readbyqxmd.com/read/28359040/comparison-of-spatiotemporal-prediction-models-of-daily-exposure-of-individuals-to-ambient-nitrogen-dioxide-and-ozone-in-montreal-canada
#13
Stephane Buteau, Marianne Hatzopoulou, Dan L Crouse, Audrey Smargiassi, Richard T Burnett, Travis Logan, Laure Deville Cavellin, Mark S Goldberg
BACKGROUND: In previous studies investigating the short-term health effects of ambient air pollution the exposure metric that is often used is the daily average across monitors, thus assuming that all individuals have the same daily exposure. Studies that incorporate space-time exposures of individuals are essential to further our understanding of the short-term health effects of ambient air pollution. OBJECTIVES: As part of a longitudinal cohort study of the acute effects of air pollution that incorporated subject-specific information and medical histories of subjects throughout the follow-up, the purpose of this study was to develop and compare different prediction models using data from fixed-site monitors and other monitoring campaigns to estimate daily, spatially-resolved concentrations of ozone (O3) and nitrogen dioxide (NO2) of participants' residences in Montreal, 1991-2002...
March 27, 2017: Environmental Research
https://www.readbyqxmd.com/read/28346028/prevalence-and-associated-factors-for-self-reported-asthma-in-a-canadian-population-the-canadian-community-health-survey-2014
#14
Luan M Chu, Punam Pahwa
BACKGROUND: Asthma prevalence is increasing among adults, yet limited information regarding the association between adult asthma and environmental and personal exposures is available using large nationally representative population-based survey. OBJECTIVE: To determine the prevalence of asthma and associated factors for self-reported asthma in a Canadian population aged 12 years and older by using the Canadian Community Health Survey (CCHS) 2014 cross-sectional cohort...
March 27, 2017: Journal of Asthma: Official Journal of the Association for the Care of Asthma
https://www.readbyqxmd.com/read/28344118/geographic-variation-in-the-relationship-between-body-mass-index-and-the-built-environment
#15
Anna M Adachi-Mejia, Chanam Lee, Chunkuen Lee, Heather A Carlos, Brian E Saelens, Ethan M Berke, Mark P Doescher
Studies examining associations between weight status and neighborhood built environment (BE) have shown inconsistent results and have generally focused on urban settings. However, many Americans do not live in metropolitan areas and BE impacts may be different outside of metropolitan areas. We sought to examine whether the relationship between body mass index (BMI) and neighborhood BE exists and varies by geographic region across small towns in the United States. We conducted telephone surveys with 2156 adults and geographic information systems data in nine towns located within three geographic regions (Northeast, Texas, Washington) in 2011 and 2012...
March 23, 2017: Preventive Medicine
https://www.readbyqxmd.com/read/28334585/uptake-and-utilization-of-practice-guidelines-in-hospitals-in-the-united-states-the-case-of-routine-episiotomy
#16
Katy B Kozhimannil, Pinar Karaca-Mandic, Cori J Blauer-Peterson, Neel T Shah, Jonathan M Snowden
BACKGROUND: The gap between publishing and implementing guidelines differs based on practice setting, including hospital geography and teaching status. On March 31, 2006, a Practice Bulletin published by the American College of Obstetricians and Gynecologists (ACOG) recommended against the routine use of episiotomy and urged clinicians to make judicious decisions to restrict the use of the procedure. OBJECTIVE: This study investigated changes in trends of episiotomy use before and after the ACOG Practice Guideline was issued in 2006, focusing on differences by hospital geographic location (rural/urban) and teaching status...
January 2017: Joint Commission Journal on Quality and Patient Safety
https://www.readbyqxmd.com/read/28281323/demerelate-calculating-inter-individual-relatedness-for-kinship-analysis-based-on-co-dominant-diploid-genetic-markers-using-r
#17
Philipp Kraemer, Gabriele Gerlach
The Demerelate package offers algorithms to calculate different inter-individual relatedness measurements. Three different allele sharing indices, five pairwise weighted estimates of relatedness and four pairwise weighted estimates with sample size correction are implemented to analyze kinship structures within populations. Statistics are based on randomization tests; modeling relatedness coefficients by logistic regression, modeling relatedness with geographic distance by mantel correlation and comparing mean relatedness between populations using pairwise t-tests...
March 9, 2017: Molecular Ecology Resources
https://www.readbyqxmd.com/read/28281057/the-death-of-the-circulatory-system-diseases-in-china-provincial-socioeconomic-and-environmental-perspective
#18
Haixia Pu, Jiatian Li, Pin Wang, Linlin Cui, Huaxin Wang
Few studies have explored the association between circulatory system diseases (CSDs) and provincial socioeconomic and environmental factors from spatial perspective, although large literature have focused on CSD. The numbers of death of hypertension disease (HD), ischemic heart disease (IHD), and cerebrovascular disease (CVD) are investigated, and 14 representative socioeconomic and environmental factors are collected. Stepwise regression model (SRM) and geographically weighted regression model (GWRM) are applied to determine the spatial correlation between the number of death of those diseases and selected factors...
March 9, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28278180/is-the-current-pertussis-incidence-only-the-results-of-testing-a-spatial-and-space-time-analysis-of-pertussis-surveillance-data-using-cluster-detection-methods-and-geographically-weighted-regression-modelling
#19
Boris Kauhl, Jeanne Heil, Christian J P A Hoebe, Jürgen Schweikart, Thomas Krafft, Nicole H T M Dukers-Muijrers
BACKGROUND: Despite high vaccination coverage, pertussis incidence in the Netherlands is amongst the highest in Europe with a shifting tendency towards adults and elderly. Early detection of outbreaks and preventive actions are necessary to prevent severe complications in infants. Efficient pertussis control requires additional background knowledge about the determinants of testing and possible determinants of the current pertussis incidence. Therefore, the aim of our study is to examine the possibility of locating possible pertussis outbreaks using space-time cluster detection and to examine the determinants of pertussis testing and incidence using geographically weighted regression models...
2017: PloS One
https://www.readbyqxmd.com/read/28273035/the-association-of-household-food-security-household-characteristics-and-school-environment-with-obesity-status-among-off-reserve-first-nations-and-m%C3%A3-tis-children-and-youth-in-canada-results-from-the-2012-aboriginal-peoples-survey
#20
Jasmin Bhawra, Martin J Cooke, Yanling Guo, Piotr Wilk
INTRODUCTION: Indigenous children are twice as likely to be classified as obese and three times as likely to experience household food insecurity when compared with non- Indigenous Canadian children. The purpose of this study was to explore the relationship between food insecurity and weight status among Métis and off-reserve First Nations children and youth across Canada. METHODS: We obtained data on children and youth aged 6 to 17 years (n = 6900) from the 2012 Aboriginal Peoples Survey...
March 2017: Health Promotion and Chronic Disease Prevention in Canada
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