AIC

AIC
  • 文章类型: Journal Article
    背景:长期心血管并发症在儿科癌症幸存者中很常见,蒽环类药物引起的高血压已成为人们关注的重要原因。与非癌症对照相比,幸存者的高血压患病率较高,随着年龄的增长,他们的发病率上升,给心血管健康带来重大危险。
    方法:研究表明,暴露于蒽环类药物是癌症存活儿童高血压发展的主要因素。研究强调蒽环类药物诱发高血压的频率和危险因素,强调常规测量和血压管理的重要性。此外,心血管毒性,比如高血压,以蒽环类为基础的治疗是一个至关重要的关注,特别是对于年轻人和青少年。儿童癌症幸存者处理各种心血管疾病,比如冠状动脉疾病和心肌病,高血压使情况变得更糟。为了防止长期并发症,筛查和监测蒽环类药物诱发的高血压至关重要。超声心动图和心脏生物标志物是早期检测和治疗的重要工具。为了降低儿科癌症幸存者的心血管风险,除了以幸存者为中心的护理计划外,综合管理策略还必须包括生活方式和药物干预措施。
    结论:主动筛查,监测,和管理措施是必要的青少年癌症幸存者,因为蒽环类药物诱导的高血压在他们的长期护理的实质性问题。为了将这些策略正确地纳入幸存者计划,肿瘤学家,心脏病学家,和初级保健医生需要一起合作。通过降低与蒽环类药物治疗相关的心血管风险并促进以幸存者为中心的护理和研究,可以提高儿科癌症幸存者的生活质量。
    BACKGROUND: Long-term cardiovascular complications are common among pediatric cancer survivors, and anthracycline-induced hypertension has become an essential reason for concern. Compared to non-cancer controls, survivors have a higher prevalence of hypertension, and as they age, their incidence rises, offering significant dangers to cardiovascular health.
    METHODS: Research demonstrates that exposure to anthracyclines is a major factor in the development of hypertension in children who have survived cancer. Research emphasizes the frequency and risk factors of anthracycline-induced hypertension, highlighting the significance of routine measurement and management of blood pressure. Furthermore, cardiovascular toxicities, such as hypertension, after anthracycline-based therapy are a crucial be concerned, especially for young adults and adolescents. Childhood cancer survivors deal with a variety of cardiovascular diseases, such as coronary artery disease and cardiomyopathy, which are made worse by high blood pressure. In order to prevent long-term complications, it is essential to screen for and monitor for anthracycline-induced hypertension. Echocardiography and cardiac biomarkers serve as essential tools for early detection and treatment. In order to lower cardiovascular risks in pediatric cancer survivors, comprehensive management strategies must include lifestyle and medication interventions in addition to survivor-centered care programs.
    CONCLUSIONS: Proactive screening, monitoring, and management measures are necessary for juvenile cancer survivors due to the substantial issue of anthracycline-induced hypertension in their long-term care. To properly include these strategies into survivor-ship programs, oncologists, cardiologists, and primary care physicians need to collaborate together. The quality of life for pediatric cancer survivors can be enhanced by reducing the cardiovascular risks linked to anthracycline therapy and promoting survivor-centered care and research.
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  • 文章类型: Journal Article
    我们考虑新开发的多项混合链接模型,用于具有DNA甲基化数据的高风险肠上皮化生(IM)研究。与通常用于分类响应的传统多项逻辑模型不同,混合链接模型允许我们为每个类别选择最合适的链接功能。我们表明,使用基于DNA甲基化数据的干细胞分裂总数(TNSC)的选定多项式混合链接模型(模型1)在十倍交叉验证的交叉熵损失方面优于传统逻辑模型,具有显着的p值8.12×10-4和6.94×10-5。根据我们选择的模型,TNSC效应在预测IM风险中的意义是合理的,p值小于10-6。当额外的协变量时,我们还选择最合适的混合链接模型(模型2和模型3),胃萎缩的状态,是可用的。当状态为负时,温和,或中度,我们推荐模型2;否则,我们更喜欢模型3。模型2和3都可以预测IM的风险明显优于模型1,这证明了胃萎缩的状态在预测IM的风险方面是有益的。
    We consider the newly developed multinomial mixed-link models for a high-risk intestinal metaplasia (IM) study with DNA methylation data. Different from the traditional multinomial logistic models commonly used for categorical responses, the mixed-link models allow us to select the most appropriate link function for each category. We show that the selected multinomial mixed-link model (Model 1) using the total number of stem cell divisions (TNSC) based on DNA methylation data outperforms the traditional logistic models in terms of cross-entropy loss from ten-fold cross-validations with significant p-values 8.12×10-4 and 6.94×10-5. Based on our selected model, the significance of TNSC\'s effect in predicting the risk of IM is justified with a p-value less than 10-6. We also select the most appropriate mixed-link models (Models 2 and 3) when an additional covariate, the status of gastric atrophy, is available. When the status is negative, mild, or moderate, we recommend Model 2; otherwise, we prefer Model 3. Both Models 2 and 3 can predict the risk of IM significantly better than Model 1, which justifies that the status of gastric atrophy is informative in predicting the risk of IM.
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  • 文章类型: Journal Article
    数据驱动的数学模型可以极大地丰富我们对传染病传播的理解。传染病传播的个体水平模型允许合并不同的个体水平协变量,比如空间位置,疫苗接种状况,等。本研究旨在探索和开发当我们有许多潜在的协变量包含在模型中时拟合此类模型的方法。目的是增强模型的性能和可解释性,并减轻将这些模型拟合到数据的计算负担。我们在空间流行病数据的背景下应用和比较了多变量选择方法。这些包括贝叶斯两阶段最小绝对收缩和选择算子(Lasso),基于Akaike信息准则(AIC)的前向和后向逐步选择,尖峰前科,和随机变量选择(提升)方法。我们通过模拟数据集和英国2001口蹄疫数据讨论和比较这些方法的性能。在比较变量选择方法时,除了两阶段Lasso之外,所有变量选择方法都表现良好。我们得出的结论是,建议使用长钉和平板先验方法,一致导致高精度和短的计算时间。
    Data-driven mathematical modelling can enrich our understanding of infectious disease spread enormously. Individual-level models of infectious disease transmission allow the incorporation of different individual-level covariates, such as spatial location, vaccination status, etc. This study aims to explore and develop methods for fitting such models when we have many potential covariates to include in the model. The aim is to enhance the performance and interpretability of models and ease the computational burden of fitting these models to data. We have applied and compared multiple variable selection methods in the context of spatial epidemic data. These include a Bayesian two-stage least absolute shrinkage and selection operator (Lasso), forward and backward stepwise selection based on the Akaike information criterion (AIC), spike-and-slab priors, and random variable selection (boosting) methods. We discuss and compare the performance of these methods via simulated datasets and UK 2001 foot-and-mouth disease data. While comparing the variable selection methods all performed consistently well except the two-stage Lasso. We conclude that the spike-and-slab prior method is to be recommended, consistently resulting in high accuracy and short computational time.
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  • 文章类型: Journal Article
    淡水飞镖属于橘色飞镖物种群,或者西西亚,广泛分布在美国中部和南部,范围跨越冰川和非冰川地区。在该复合体中已确认多达15种,有一个,特别是耳鼻孔,有广泛的北方分布和另一个,喉管口,有相当大的南方分布。建筑群中的其他物种在中部高地的非冰川地区分布更为有限。我们对来自52个地点的384个飞镖进行了采样,覆盖了大部分的Casia范围,并评估了遗传多样性的模式,遗传结构,以及冰期前后的范围收缩和扩展模式。我们预计在非冰川地区发现更强的遗传分化和多样化信号,鉴于那里报道的物种多样性和特有水平较高。令人惊讶的是,微卫星基因分型揭示了冰川地区样品中大肠杆菌的两个分化良好的遗传簇,一个局限于伊利诺伊河流域,另一个在瓦巴什排水和大湖支流中发现。这表明两个孤立的冰川避难所有扩张,几乎没有随后的冰川后基因流。从整个非冰川地区收集的鱼在基因上的分化程度较低。根据收集地点和形态特征分配给Etheostomaburri和Etheostomauniporum的鱼类与该地区的特殊样品没有遗传区分。在中部高地发生的杂交和渗入可能会混淆该地区特有性和多样性高的物种的遗传描述。
    Freshwater darters belonging to the orangethroat darter species complex, or Ceasia, are widely distributed in the Central and Southern United States, with ranges that span both glaciated and unglaciated regions. Up to 15 species have been recognized in the complex, with one, Etheostoma spectabile, having a widespread northern distribution and another, Etheostoma pulchellum, having a sizeable southern distribution. The other species in the complex have much more restricted distributions in unglaciated regions of the Central Highlands. We sampled 384 darters from 52 sites covering much of the range of Ceasia and evaluated patterns of genetic diversity, genetic structure, and pre- and post-glacial patterns of range contraction and expansion. We anticipated finding much stronger signals of genetic differentiation and diversification in unglaciated regions, given the higher species diversity and levels of endemism reported there. Surprisingly, microsatellite genotyping revealed two well-differentiated genetic clusters of E. spectabile in samples from glaciated regions, one confined to the Illinois River basin and another found in the Wabash drainage and Great Lakes tributaries. This suggests that there was expansion from two isolated glacial refugia, with little subsequent post-glacial gene flow. Fish collected from throughout the unglaciated region were less genetically differentiated. Fish assigned to Etheostoma burri and Etheostoma uniporum based on collection sites and morphological characters were not genetically differentiated from E. spectabile samples from the region. Hybridization and introgression occurring in the Central Highlands may confound genetic delineation of species in this region of high endemism and diversity.
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  • 文章类型: Journal Article
    脑磁图(MEG)是研究人脑功能的强大技术。然而,由于低信噪比(SNR),准确估计有助于MEG记录的源的数量仍然是一个具有挑战性的问题,相关来源的存在,头部建模不准确,和个体解剖学的变化。
    为了解决这些问题,我们的研究引入了一种基于F比统计方法准确估计大脑中活动源数量的稳健方法,这允许在具有较高数量的源的完整模型和具有较少来源的简化模型之间进行比较。使用这种方法,我们开发了一个正式的统计程序,该程序在多偶极子定位问题中依次增加源的数量,直到找到所有源为止。
    我们的结果表明,阈值的选择在确定方法的整体性能方面起着至关重要的作用,以及需要调整源数量和SNR级别的适当阈值,虽然它们对不同的源间相关性基本上保持不变,平移建模不准确,和不同的皮质解剖结构。通过确定最佳阈值并在模拟中验证我们基于F比的方法,真正的幻影,和人类MEG数据,我们证明了我们的基于F比的方法优于现有的最先进的统计方法,例如Akaike信息标准(AIC)和最小描述长度(MDL)。
    总的来说,当调整为最佳选择阈值时,我们的方法为研究人员提供了一个精确的工具来估计活跃脑源的真实数量并准确地模拟大脑功能。
    UNASSIGNED: Magnetoencephalography (MEG) is a powerful technique for studying the human brain function. However, accurately estimating the number of sources that contribute to the MEG recordings remains a challenging problem due to the low signal-to-noise ratio (SNR), the presence of correlated sources, inaccuracies in head modeling, and variations in individual anatomy.
    UNASSIGNED: To address these issues, our study introduces a robust method for accurately estimating the number of active sources in the brain based on the F-ratio statistical approach, which allows for a comparison between a full model with a higher number of sources and a reduced model with fewer sources. Using this approach, we developed a formal statistical procedure that sequentially increases the number of sources in the multiple dipole localization problem until all sources are found.
    UNASSIGNED: Our results revealed that the selection of thresholds plays a critical role in determining the method\'s overall performance, and appropriate thresholds needed to be adjusted for the number of sources and SNR levels, while they remained largely invariant to different inter-source correlations, translational modeling inaccuracies, and different cortical anatomies. By identifying optimal thresholds and validating our F-ratio-based method in simulated, real phantom, and human MEG data, we demonstrated the superiority of our F-ratio-based method over existing state-of-the-art statistical approaches, such as the Akaike Information Criterion (AIC) and Minimum Description Length (MDL).
    UNASSIGNED: Overall, when tuned for optimal selection of thresholds, our method offers researchers a precise tool to estimate the true number of active brain sources and accurately model brain function.
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  • 文章类型: Journal Article
    背景:COVID-19导致的住院时间(LOHS)造成了经济负担,医疗服务系统的成本以及患者和卫生工作者的高心理负担。这项研究的目的是采用基于线性回归模型的贝叶斯模型平均(BMA),并确定COVID-19LOHS的预测因子。
    方法:在这项历史队列研究中,从5100名在医院数据库注册的COVID-19患者中,4996名患者有资格进入研究。数据包括人口统计,临床,生物标志物,和LOHS。影响LOHS的因素在六个模型中进行了拟合,包括逐步方法,AIC,经典线性回归模型中的BIC,使用奥卡姆窗口和马尔可夫链蒙特卡罗(MCMC)方法的两个BMA,和GBDT算法,一种新的机器学习方法。
    结果:平均住院时间为6.7±5.7天。在拟合经典线性模型时,逐步法和AIC法(R2=0.168,调整后的R2=0.165)均优于BIC法(R2=0.160,调整后的R2=0.158)。在适应BMA时,Occam的Window模型的性能优于MCMC,R2=0.174。值R2=0.64的GBDT方法在测试数据集中的表现比BMA差,但在训练数据集中没有表现。基于六个拟合模型,在ICU住院,呼吸窘迫,年龄,糖尿病,CRP,PO2,WBC,AST,BUN,NLR与预测COVID-19的LOHS显著相关。
    结论:使用Occam\'sWindow方法的BMA在预测测试数据集中的LOHS影响因素方面比其他模型具有更好的拟合和性能。
    The length of hospital stay (LOHS) caused by COVID-19 has imposed a financial burden, and cost on the healthcare service system and a high psychological burden on patients and health workers. The purpose of this study is to adopt the Bayesian model averaging (BMA) based on linear regression models and to determine the predictors of the LOHS of COVID-19.
    In this historical cohort study, from 5100 COVID-19 patients who had registered in the hospital database, 4996 patients were eligible to enter the study. The data included demographic, clinical, biomarkers, and LOHS. Factors affecting the LOHS were fitted in six models, including the stepwise method, AIC, BIC in classical linear regression models, two BMA using Occam\'s Window and Markov Chain Monte Carlo (MCMC) methods, and GBDT algorithm, a new method of machine learning.
    The average length of hospitalization was 6.7 ± 5.7 days. In fitting classical linear models, both stepwise and AIC methods (R 2 = 0.168 and adjusted R 2 = 0.165) performed better than BIC (R 2 = 0.160 and adjusted = 0.158). In fitting the BMA, Occam\'s Window model has performed better than MCMC with R 2 = 0.174. The GBDT method with the value of R 2 = 0.64, has performed worse than the BMA in the testing dataset but not in the training dataset. Based on the six fitted models, hospitalized in ICU, respiratory distress, age, diabetes, CRP, PO2, WBC, AST, BUN, and NLR were associated significantly with predicting LOHS of COVID-19.
    The BMA with Occam\'s Window method has a better fit and better performance in predicting affecting factors on the LOHS in the testing dataset than other models.
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  • 文章类型: Journal Article
    面对旅客和货运的持续增长,航空业面临着巨大的挑战,要限制其对气候的影响。液态氢(LH2)是正在考虑的替代喷气燃料之一,因为它在燃烧时不会产生二氧化碳。我们对17条不同的制氢路线的每乘客距离的CO2排放和非CO2气候变化影响进行了良好的生命周期评估。以及传统的喷气燃料和生物燃料。还考虑了其他六个环境和健康影响类别。波音787-800被用作参考飞机,探索了一系列飞行距离。Contrailcirrus对LH2的燃烧气候影响约为81±31%,而常规喷气燃料为32±7%。表明在LH2的情况下,需要进行研究以减少不确定性。两种主要的商业LH2途径的生命周期影响平均比常规喷气燃料大8%和121%。与常规燃料相比,一些新的LH2途径确实显示出减少生命周期气候影响的巨大潜力(高达-205±78%)。来自可再生能源的LH2不是气候中性的,虽然,在整个生命周期中,与传统产品相比,充其量为-67±10%。
    The aviation industry faces a formidable challenge to cap its climate impact in the face of continued growth in passengers and freight. Liquid hydrogen (LH2) is one of the alternative jet fuels under consideration as it does not produce carbon dioxide upon combustion. We conducted a well-to-wake life cycle assessment of CO2 emissions and non-CO2 climate change impacts per passenger-distance for 17 different hydrogen production routes, as well as conventional jet fuel and biofuels. Six other environmental and health impact categories were also considered. The Boeing 787-800 was used as the reference aircraft, and a range of flight distances were explored. Contrail cirrus contributes around 81 ± 31% of the combustion climate impacts for LH2, compared to 32 ± 7% for conventional jet fuel, showing that research is needed to reduce uncertainty in the case of LH2. The life cycle impacts of the two dominant commercial LH2 pathways are on average 8 and 121% larger than conventional jet fuel. Some novel LH2 pathways do show considerable potential for life cycle climate impact reductions versus conventional fuel (up to -205 ± 78%). LH2 from renewable energy is not climate neutral, though, at best -67 ± 10% compared to conventional over the life cycle.
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  • 文章类型: Journal Article
    道路交通事故造成的死亡人数与日俱增,几十年来已经成为一个令人担忧的全球问题。印度,随着她日益机动化,对这场全球灾难并不陌生。在本文中,两种相对简单但功能强大且通用的时间序列数据预测技术,自回归综合移动平均法(ARIMA)和指数平滑法用于预测2022-2031年印度道路交通事故造成的死亡人数。对基于这两种方法的结果进行了比较,发现它们彼此同步并与现有文献同步。此外,这是对同一数据使用两种时间序列分析技术并进行比较分析的独特尝试。这些数据来自道路运输和公路部的年度报告,印度(2020)和印度意外死亡和自杀(ADSI)国家犯罪记录局报告(2021)。在检查了所有可能的模型之后,观察到ARIMA(2,2,2)模型和指数平滑(M,A,N)模型适用于给定的数据。在这两个人中,ARIMA(2,2,2)模型具有较低的AIC和BIC值。因此,根据我们的模型选择标准,这是最好的模型。Further,该研究还揭示了印度未来10年道路意外死亡人数的上升趋势。
    The number of deaths due to road accident is increasing day by day and has become an alarming global problem over the decades. India, with her rising motorization is no stranger to this global catastrophe. In this paper two relatively simple yet powerful and versatile techniques for forecasting time series data, autoregressive integrated moving average method (ARIMA) and exponential smoothing method are used to forecast the number of deaths due to road accidents in India from the year 2022-2031. The results based on the two methods are compared and it is found that they are in sync with each other and pre-existing literature. Furthermore, this is a unique attempt to use two time series analysis techniques on the same data and carry out a comparative analysis. The data was collected from the annual report of Ministry of Road Transport and Highways, India (2020) and Accidental Deaths & Suicides in India (ADSI) Report of National Crime Record Bureau (2021). After examining all the probable models, it is observed that ARIMA (2, 2, 2) model and exponential smoothing (M, A, N) model are suitable for the given data. Amongst the two, ARIMA (2, 2, 2) model has a lower AIC and BIC value. Thus, this comes out to be the best model as per our model selection criterion. Further, the study also reveals an upward trend of number of road accidental deaths for the upcoming 10 years in India.
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  • 文章类型: Journal Article
    地震预测中的一个重要问题是中等或大地震是否会发生更大的地震。通过时间b值演化分析,交通灯系统可以用来估计地震是否是前震。然而,交通灯系统在b值构成标准时没有考虑到它们的不确定性。在这项研究中,我们建议使用Akaike信息标准(AIC)和bootstrap对交通信号灯系统进行优化。交通灯信号由样本和背景之间的b值差异的显著性水平而不是任意常数来控制。我们将优化后的交通灯系统应用于2021年的扬壁地震序列,使用b值的时间和空间变化,可以明确地将其识别为前震-主震-余震。此外,我们使用了一个与地震之间的距离相关的新统计参数来跟踪地震成核特征。我们还确认,优化的交通灯系统适用于包括小震级地震的高分辨率目录。综合考虑b值,显著性概率,地震聚类可以提高地震风险判断的可靠性。
    One important question in earthquake prediction is whether a moderate or large earthquake will be followed by an even bigger one. Through temporal b-value evolution analysis, the traffic light system can be used to estimate if an earthquake is a foreshock. However, the traffic light system does not take into account the uncertainty of b-values when they constitute a criterion. In this study, we propose an optimization of the traffic light system with the Akaike Information Criterion (AIC) and bootstrap. The traffic light signals are controlled by the significance level of the difference in b-value between the sample and the background rather than an arbitrary constant. We applied the optimized traffic light system to the 2021 Yangbi earthquake sequence, which could be explicitly recognized as foreshock-mainshock-aftershock using the temporal and spatial variations in b-values. In addition, we used a new statistical parameter related to the distance between earthquakes to track earthquake nucleation features. We also confirmed that the optimized traffic light system works on a high-resolution catalog that includes small-magnitude earthquakes. The comprehensive consideration of b-value, significance probability, and seismic clustering might improve the reliability of earthquake risk judgment.
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  • 文章类型: Journal Article
    介绍了一种新的低维广义线性模型的变量选择方法。称为通过稳定性选择(OPT-STABS)的AICOPTimization的新方法反复对数据进行子采样,在每个子样本的一系列嵌套模型上最小化Akaike的信息准则(AIC),并且在最终模型中包括在大部分子样本中的最小AIC模型中选择的那些预测因子。还引入了新方法来建立重复子样本的最佳变量选择截止值。对各种proposec变量选择方法进行了广泛的模拟研究,结果表明,尽管在所有考虑的方案中,没有一种方法能统一优于其他方法,OPT-STABS在大多数设置中始终是性能最佳的方法之一,而在其余设置中具有竞争力。这与其他候选方法相反,这些候选方法要么在整体上表现不佳,要么在某些情况下表现良好。但其他人却很可怜。此外,推导了OPT-STABS估计器的渐近性质,证明了其根-n相合性和渐近正态。这些方法适用于涉及逻辑回归和泊松回归的两个数据集。
    A novel variable selection method for low-dimensional generalized linear models is introduced. The new approach called AIC OPTimization via STABility Selection (OPT-STABS) repeatedly subsamples the data, minimizes Akaike\'s Information Criterion (AIC) over a sequence of nested models for each subsample, and includes in the final model those predictors selected in the minimum AIC model in a large fraction of the subsamples. New methods are also introduced to establish an optimal variable selection cutoff over repeated subsamples. An extensive simulation study examining a variety of proposec variable selection methods shows that, although no single method uniformly outperforms the others in all the scenarios considered, OPT-STABS is consistently among the best-performing methods in most settings while it performs competitively for the rest. This is in contrast to other candidate methods which either have poor performance across the board or exhibit good performance in some settings, but very poor in others. In addition, the asymptotic properties of the OPT-STABS estimator are derived, and its root-n consistency and asymptotic normality are proved. The methods are applied to two datasets involving logistic and Poisson regressions.
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