Fixed effect model

  • 文章类型: Journal Article
    尽管低出生体重(LBW)的患病率随着时间的推移有所下降,它作为孟加拉国公共卫生问题的持续重要性仍然显而易见。低出生体重被认为是导致婴儿死亡率的一个因素,长期的健康并发症,以及对非传染性疾病的脆弱性。本研究利用2012-2013年和2019年进行的多指标类集调查(MICS)的全国代表性数据来探讨与出生体重相关的因素。出生体重数据建模考虑了因素之间的相互作用,数据中的聚类,和空间相关性。生成区级地图以识别LBW的高风险区域。平均出生体重略有增加,从2012-2013年的2.93公斤上升到2019年的2.96公斤。这项研究采用了回归树,一种流行的机器学习算法,辨别出生体重潜在决定因素之间的基本相互作用。各种模型的发现,包括固定效应,混合效应,和空间依赖模型,强调产妇年龄等因素的重要性,户主的教育,产前保健,很少有数据驱动的相互作用影响出生体重。特定地区的地图显示,西南地区和选定的北部地区的平均出生体重较低,在两个调查期间坚持。考虑层次结构和空间自相关,提高了模型性能,特别是在拟合最近一轮调查数据时。该研究旨在通过利用机器学习技术和回归模型来识别需要高度关注的弱势儿童群体,从而为地区一级的政策制定和有针对性的干预措施提供信息。
    Despite a decrease in the prevalence of low birth weight (LBW) over time, its ongoing significance as a public health concern in Bangladesh remains evident. Low birth weight is believed to be a contributing factor to infant mortality, prolonged health complications, and vulnerability to non-communicable diseases. This study utilizes nationally representative data from the Multiple Indicator Cluster Surveys (MICS) conducted in 2012-2013 and 2019 to explore factors associated with birth weight. Modeling birth weight data considers interactions among factors, clustering in data, and spatial correlation. District-level maps are generated to identify high-risk areas for LBW. The average birth weight has shown a modest increase, rising from 2.93 kg in 2012-2013 to 2.96 kg in 2019. The study employs a regression tree, a popular machine learning algorithm, to discern essential interactions among potential determinants of birth weight. Findings from various models, including fixed effect, mixed effect, and spatial dependence models, highlight the significance of factors such as maternal age, household head\'s education, antenatal care, and few data-driven interactions influencing birth weight. District-specific maps reveal lower average birth weights in the southwestern region and selected northern districts, persisting across the two survey periods. Accounting for hierarchical structure and spatial autocorrelation improves model performance, particularly when fitting the most recent round of survey data. The study aims to inform policy formulation and targeted interventions at the district level by utilizing a machine learning technique and regression models to identify vulnerable groups of children requiring heightened attention.
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  • 文章类型: Journal Article
    《2030年议程》的主要目标之一是通过提高教育水平消除贫困。事实上,一个国家良好的教育水平和文化投资是保证可持续经济的必要条件,其中,令人满意的生活质量水平和公平的收入分配并存。特别是缺乏对一些重要维度之间关系的研究,比如教育,文化与贫困,考虑时间滞后来衡量影响。因此,这项研究旨在通过关注教育之间的关系来填补这一空白,文化与贫困基于来自34个欧洲国家的一组数据,在5年的时间里,2015-2019年。为此,在应用主成分分析避免多重共线性问题后,作者应用了三种不同的方法:混合普通最小二乘模型,固定效应模型和随机效应模型。选择固定效应估计器作为最优和最合适的模型。结果突出表明,这些国家提高教育和文化水平可以减少贫困。这为新的研究路径和政策战略开辟了空间,可以从这种联系开始,实施旨在扩大和改善教育和文化服务的具体行动。
    The 2030 Agenda has among its key objectives the poverty eradication through increasing the level of education. A good level of education and investment in culture of a country is in fact necessary to guarantee a sustainable economy, in which coexists satisfactory levels of quality of life and an equitable distribution of income. There is a lack of studies in particular on the relations between some significant dimensions, such as education, culture and poverty, considering time lags for the measurement of impacts. Therefore, this study aims to fill this gap by focusing on the relationship between education, culture and poverty based on a panel of data from 34 European countries, over a 5-year period, 2015-2019. For this purpose, after applying principal component analysis to avoid multicollinearity problems, the authors applied three different approaches: pooled-ordinary least squares model, fixed effect model and random effect model. Fixed-effects estimator was selected as the optimal and most appropriate model. The results highlight that increasing education and culture levels in these countries reduce poverty. This opens space to new research paths and policy strategies that can start from this connection to implement concrete actions aimed at widening and improving educational and cultural offer.
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  • 文章类型: Journal Article
    近年来和几十年来,一些高温记录已经被打破。极端高温不仅损害人体健康,但也增加了野火的风险。作为城市基础设施,城市绿地已被证明具有降温作用。在这项研究中,收集了西安36个绿地的物理指标和温度数据,通过相关性分析探讨了绿地不同物理指标对其热环境的影响。结果表明,绿地的面积应在0.6-0.7平方公里之间,或周长应在4000-4500m之间,以获得最低的内部温度。当绿地中的水体面积在0.3-0.4平方公里之间或周长约为5000m时,它的内部温度最低。结论中的绿地指标可以直接被城市规划者和决策者理解和参考。因此,这项研究的结果对通过控制绿地的物理指标来改善城市热舒适度具有重要意义。
    Several heat records have been broken in recent years and decades. Extreme high temperature not only damages human health, but also increases the risk of wildfires. As a common urban infrastructure, urban green space has been proved to have a cooling effect. In this study, the physical indicators and temperature data of 36 green spaces in Xi\'an were collected, and the influence of different physical indicators of green spaces on their thermal environment was explored through correlation analysis. The results suggest that the area of green space should be between 0.6-0.7 square kilometers or the perimeter should range from 4000 to 4500 m in order to obtain the lowest internal temperature. When the area of water body in the green space is between 0.3-0.4 square kilometers or the perimeter is about 5000 m, its internal temperature is the lowest. Indicators of green space in the conclusion can be directly understood and referred by urban planners and policy makers. Results of this study thus have implications for improving urban thermal comfort by controlling the physical indicators of green space.
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  • 文章类型: Journal Article
    长江经济带(YREB)沿线普遍存在的空气污染对自然环境具有重大威胁,这进一步影响了附近旅游目的地的发展。本文试图通过31个地级市2002-2012年的面板数据来评估空气污染对该地区旅游业的影响。以及地理信息系统(GIS)和聚类分析。结果表明,空气污染与YREB沿线的入境游客数量呈负相关。总的来说,当空气污染加剧1%时,入境游客人数减少1.171%。当空气污染更严重时,这种影响更加明显,从长远来看,在更大的地区,更中心,和更多的旅游资源。本文通过解决先前研究中的常见局限性,并对空气污染对YREB入境旅游的影响进行了更全面的评估,从而为文献做出了贡献。关于基于空气污染时期的公共政策和发展方向的实际影响,regions,并提供了旅游资源配置。
    The prevalent air pollution along the Yangtze River Economic Belt (YREB) possesses a significant threat to the natural environment, which further affects nearby tourism destination development. The paper seeks to assess the impact of air pollution on tourism in this region through a 2002-2012 panel data of 31 prefecture-level cities, along with geographic information system (GIS) and cluster analyses. The results reveal that air pollution is negatively associated with the number of inbound tourists along the YREB. In general, when air pollution intensifies by 1%, the number of inbound tourists decreases by 1.171%. This impact is more evident when air pollution is more severe, in the long term, and in areas that are larger, more central, and with more tourism resources. The paper contributes to the literature by addressing common limitations in previous studies and providing a more comprehensive evaluation of air pollution\'s impact on inbound tourism in the YREB. Practical implications regarding public policies and development directions based on air pollution periods, regions, and tourism resource allocations are provided.
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  • 文章类型: Journal Article
    水污染不仅加剧生态环境恶化,危害人类健康,但也对经济增长和社会发展产生重大负面影响。研究工业废水治理与工业废水污染之间的关系对减少水污染的路径至关重要。在本文中,采用面板固定效应模型和系统广义矩估计模型(SYS-GMM),利用中国2005-2020年30个省份的面板数据,研究了工业废水治理对工业废水污染的影响。这是对工业废水治理与工业废水污染关系的唯一实证分析。我们代理了有机污染物和无机污染物对工业废水的污染,并测量了工业废水治理的人均投资。结果揭示了人均工业废水治理投资与工业废水污染之间的正相关关系。人均工业废水治理投入的增加促进了工业废水污染物排放量的增加。估算还表明,人均GDP与工业废水中的无机/有机污染物之间存在倒U型关系。实证研究表明,必须加大工业废水处理投资力度,优化环境治理投资结构,从而为多种环境治理方案的综合利用铺平道路。
    Water pollution not only aggravates the deterioration of the ecological environment and endanger human health, but also has a significantly negative impact on economic growth and social development. It is crucial to investigate the relationship between industrial wastewater governance and industrial wastewater pollution on the path to reduce water pollution. In this paper, we studied whether industrial wastewater governance affected industrial wastewater pollution using the panel fixed effect model and system generalized moment estimation model (SYS-GMM) with the panel data of 30 provinces from 2005 to 2020 in China. This is the only empirical analysis of the relationship between industrial wastewater governance and industrial wastewater pollution. We proxied industrial wastewater pollution by organic pollutants and inorganic pollutants and measured the per capita investment in industrial wastewater governance. The results shed light on the positive correlation between the per capita investment in industrial wastewater governance and industrial wastewater pollution. The increase in per capita investment in industrial wastewater governance promoted the increase of pollutant emissions from industrial wastewater. The estimation also indicated that there was an inverted U-shaped relationship between per capita GDP and inorganic /organic pollutants in industrial wastewater. Our empirical research shows that it is necessary to increase investment in industrial wastewater treatment and optimize the investment structure of environmental treatment, so as to pave the way for the comprehensive utilization of a variety of environmental treatment solutions.
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  • 文章类型: Journal Article
    火电行业承担着节能环保的重要社会责任。火电行业的碳排放量受产业结构的影响。在本文中,火力发电的碳排放分为三个环节:能源燃烧,脱硫工艺,和电力运输。计算了2000-2017年中国西部11个省份火电的碳排放总量。结合产业改革,本文构建面板数据固定效应模型,系统分析西部地区火电碳排放与产业结构的交互响应关系。研究表明,由于水电规模的不断扩大,风力发电,等新能源发电规模和西部地区能源利用效率的提高,2010年以来,火电碳排放增长趋势有所放缓。产业发展模式是区域经济发展的主要动力,西部地区第二产业是火电碳排放的主要驱动因素。可以通过技术升级促进西部地区经济的高质量发展,新能源开发,和工业多模式操作。
    The thermal power industry takes the important social responsibility of energy conservation and environmental protection. The carbon emissions made by the thermal power industry are affected by the industrial structure. In this paper, the carbon emission of thermal power generation is divided into three links: energy combustion, desulfurization process, and power transportation. The total carbon emission of thermal power in 11 provinces in western China from 2000 to 2017 is calculated. Combined with industrial reform, this paper constructs a panel data fixed effect model to systematically analyze the interactive response relationship between thermal power carbon emission and industrial structure in the western region. The research shows that due to the continuous expansion of hydropower, wind power, and other new energy power generation scale and the improvement of energy efficiency in the western region, the growth trend of thermal power carbon emission has slowed down since 2010. The industrial development pattern is the main driving force of regional economic development, and the secondary industry in the western region is the main driving factor of thermal power carbon emission. High quality economic development in the western region can be promoted through technological upgrading, new energy development, and industrial multi-mode operation.
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  • 文章类型: Journal Article
    Flypaper效应是一个公共财政术语,表明给予受援城市的政府赠款增加了当地社区的支出水平,而不是同等规模的当地收入增加。本文分析了扩大区域自治的Flypaper效应评估方法。它在1999-2021年期间在印度尼西亚使用了210个新自治区(NAR)作为案例研究,印度尼西亚成为世界上新自治国家数量最多的国家。利用面板数据回归来确定Flypaper效应。使用BLUE模型选择方法进行了Flypaper效应分析。本研究中选择的模型是集合最小二乘法(PLS),固定效应模型(FEM)和随机效应模型(REM)。几个测试,比如ChowTest,拉格朗日乘数测试,和豪斯曼测试,进行了。此外,执行了以蓝色获取数据的程序,如异方差和自相关检验。Koenker-Bassett检验用于确定异质性。•面板数据回归被用作确定自治区中的Flypaper效应的方法。•通过计算/过程示例讨论该方法中的每个阶段。•建议使用本文中使用的方法来确定各方的新自治区(NAR)的Flypaper效应。
    Flypaper Effect is a public finance term that indicates a government grant given to recipient cities increases the local community spending level more than an increase in local income of equivalent size. This paper analyzed the Flypaper Effect Assessment Method in the Expansion of Regional Autonomy. It employed 210 New Autonomous Regions (NARs) in Indonesia during 1999-2021 as a case study, where Indonesia became the country with the highest number of new autonomies in the world. Panel Data Regression was utilized to determine the Flypaper Effect. Flypaper Effect analysis was carried out using the BLUE model selection method. The selected models in this study were Pooled Least Square (PLS), Fixed Effect Model (FEM), and Random Effect Model (REM). Several tests, such as Chow Test, Lagrange Multiplier Test, and Hausman Test, were conducted. Furthermore, the procedures to get the data in BLUE were carried out, such as Heteroscedasticity and Autocorrelation Test. Koenker-Bassett test was used for ascertaining Heterocedascity.•Panel Data Regression is used as a method to determine the Flypaper Effect in the autonomous region.•Each stage in this method is discussed with a calculation/process example.•The method utilized in this paper is recommended to determine the Flypaper Effect of New Autonomous Regions (NARs) for various parties.
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  • 文章类型: Journal Article
    There is significant interest among policymakers and academics about whether or not green credit, which is a market-oriented environmental policy tool, has achieved its intended effect in improving the environment in China. This paper addresses this question from both theoretical and empirical perspectives. Using panel data from 30 provincial administrative regions of China from 2007 to 2016, we apply the fixed effect model and the gray correlation analysis method to examine the influence and its mechanism of green credit on China\'s environmental quality. The results show that green credit does improve China\'s environmental quality overall. Green credit can reduce environmental pollution through three mechanisms: improving enterprise performance, motivating enterprise innovation, and upgrading industrial structure. However, there are regional differences in the emission-reduction effect of green credit. Green credit improves the environmental quality in resource-based regions more than non-resource-based regions; the emission-reduction effect is significant in regions with developed financial markets, but not significant elsewhere. The results indicate that green credit policies should be regionally differentiated to more effectively achieve emission-reduction targets.
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  • 文章类型: Journal Article
    随着人口老龄化(PA),医疗保健支出(HE)增加。本研究的目的是分析不同年龄段的HE以及年龄对不同年龄段HE的影响。
    结合PA和HE数据,本研究采用固定效应模型和参数估计方法评估2008-2014年不同年龄组对HE的影响。
    HE对65岁及以上人群的年龄效应在不同年龄组中最为显著。根据PA和HE数据,65岁及以上年龄组的人均HE是25岁以下人口的7.25倍,是25~59岁人口的1.61倍,是60~64岁人口的3.47倍。根据固定效应模型的结果,25岁以下年龄组的人均收入为218.39元(CNY)(31.2美元)。25~59岁年龄组的人均HE增加到1,548.62元(CNY)(221.2美元)。60~64岁年龄组的人均高等教育将为921.56元(CNY)(131.7美元),<25岁年龄组的4.22倍。65岁及以上年龄组的人均人均收入为2,538.88元(CNY)(362.7美元),是25岁以下年龄组的11.63倍。
    结果表明,PA在中国正在加剧。为了控制他的崛起,政府不仅应该解决供应方面的问题,例如改革医疗保险支付,开发新技术,但也着眼于解决需求方面的问题,例如提高医疗服务质量,解决环境污染,改善居民的健康。
    UNASSIGNED: With population aging (PA), the healthcare expenditure (HE) increases. The aim of this study is to analyze the HE of different age groups and the effect of age on HE among different age groups.
    UNASSIGNED: Combining PA and HE data, this study used the fixed effect model and parameter estimation method to evaluate the influence of different age groups on HE from 2008 to 2014.
    UNASSIGNED: The age effect of HE for the population aged 65 or over was the most significant among the different age groups. Based on PA and HE data, HE per capita of the age group 65 years or over is 7.25 times as much as the population aged < 25 years, 1.61 times as much as the population aged 25~59 years, and 3.47 times as much as the population aged 60~64 years. Based on the result of the fixed effect model, HE per capita of the age group <25 years was 218.39 Yuan (CNY) (USD $31.2). HE per capita of the age group 25~59 years old increased to 1,548.62 Yuan (CNY) (USD $221.2). HE per capita of the 60~64 years age group will be 921.56 Yuan (CNY) (USD $131.7), 4.22 times as much as that of the age group < 25 years. HE per capita in the age group of 65 years or over is 2,538.88 Yuan (CNY) (USD $362.7), 11.63 times as much as that of the age group <25 years.
    UNASSIGNED: The results suggest that PA in China is intensifying. In order to control the rising of HE, the government should not only address the supply side such as reforming medical insurance payment, developing new technologies, but also focusing on solving the demand side such as improving the quality of healthcare services, solving environmental pollution, and improving the residents\' health.
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  • 文章类型: Journal Article
    背景:抗菌素耐药性(AMR),尤其是耐碳青霉烯类铜绿假单胞菌(CRPA),导致发病率严重上升,死亡率和成本。医疗专业人员在遏制AMR方面发挥着重要作用。先前的研究忽略了工作量对医疗专业人员与AMR之间关系的影响。本研究旨在探讨医务人员与CRPA率之间的关系以及医务人员工作量对这种关系的调节作用。
    方法:构建2014-2017年省级面板数据集。医疗专业人员是由医生的数量来衡量的,注册护士,药剂师,和临床微生物学家每1000人。工作量是通过每日医师就诊次数来衡量的。采用固定效应模型和层次回归分析探讨工作量对医务人员和CRPA率的调节作用。
    结果:医生的数量,注册护士,药剂师和临床技术人员与CRPA率显着负相关(coef。=-0.889、-0.775、-1.176和-0.822;P分别=0.003、0.003、0.011和0.007)。工作量对医生有显著的积极调节作用,注册护士,药剂师,临床技术人员和CRPA率(系数。=1.270、1.400、2.210和1.634;P分别为0.004、0.001、0.035和0.003)。
    结论:增加医疗专业人员的数量可能有助于抑制CRPA率。应实施旨在减少医疗专业人员工作量的措施,以进一步提高CRPA绩效。
    BACKGROUND: Antimicrobial resistance (AMR), especially carbapenem-resistant Pseudomonas aeruginosa (CRPA), causes a serious increase in morbidity, mortality and costs. Medical professionals play an important role in curbing AMR. Previous studies overlooked the impact of workload on the relationship between medical professionals and AMR. This study aimed to explore the relationship between medical professionals and the CRPA rate as well as the moderating effect of medical professionals\' workload on this relationship.
    METHODS: A provincial-level panel dataset from 2014 to 2017 was constructed. Medical professionals were measured by the numbers of physicians, registered nurses, pharmacists, and clinical microbiologists per 1000 population. Workload was measured by the number of daily physician visits. Fixed effect model and hierarchical regression analysis were performed to explore the moderating effect of workload on medical professionals and the CRPA rate.
    RESULTS: The numbers of physicians, registered nurses, pharmacists and clinical technicians were significantly negative associated with the CRPA rate (coef. = - 0.889, - 0.775, - 1.176, and - 0.822; P = 0.003, 0.003, 0.011, and 0.007, respectively). Workload had a significant and positive moderating effect on physicians, registered nurses, pharmacists, clinical technicians and the CRPA rate (coef. = 1.270, 1.400, 2.210, and 1.634; P = 0.004, 0.001, 0.035, and 0.003, respectively).
    CONCLUSIONS: Increasing the number of medical professionals may help curb the CRPA rate. Measures aimed at reducing medical professionals\' workload should be implemented to further improve CRPA performance.
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