SARIMA

SARIMA
  • 文章类型: Journal Article
    在海上救助个人是一个紧迫的全球公共卫生问题,引起急诊医学研究人员的广泛关注,重点是改善预防和控制策略。本研究旨在利用海上紧急事件数据开发动态贝叶斯网络(DBN)模型,并将其预测精度与自回归综合移动平均(ARIMA)和季节性自回归综合移动平均(SARIMA)模型进行比较。
    在这项研究中,我们分析了2016年1月至2020年12月海南省5家医院在海上急救背景下管理的病例数.我们采用了不同的方法来构建和校准ARIMA,SARIMA,和DBN模型。这些模型随后被用来预测2021年1月至2021年12月的应急人员数量。研究表明,ARIMA,SARIMA,和DBN模型有效地对海上急救医疗服务(EMS)患者数据进行建模和预测,考虑季节性变化。使用平均绝对误差(MAE)评估预测准确性,均方根误差(RMSE),和确定系数(R2)作为性能指标。
    在这项研究中,ARIMA,SARIMA,和DBN模型报告的RMSE分别为5.75、4.43和5.45;MAE分别为4.13、2.81和3.85;R2值分别为0.21、0.54和0.44。MAE和RMSE评估实际值和预测值之间的差异水平。值越小表示模型预测越准确。R2可以比较不同方面的模型性能,值范围从0到1。值接近1表示更好的模型质量。随着错误的增加,R2从最大值进一步移动。SARIMA模型胜过其他模型,显示最低的RMSE和MAE,除了最高的R2,在建模和预测期间。对预测值和拟合图的分析表明,在大多数情况下,SARIMA的预测与实际救援次数非常吻合。因此,SARIMA在拟合和预测方面都很优越,其次是DBN模型,ARIMA显示出最不准确的预测。
    虽然DBN模型巧妙地捕获了变量相关性,SARIMA模型擅长预测海上紧急情况。通过比较这些模型,我们收集了有关海上应急趋势的宝贵见解,促进制定有效的预防和控制策略。
    UNASSIGNED: Rescuing individuals at sea is a pressing global public health issue, garnering substantial attention from emergency medicine researchers with a focus on improving prevention and control strategies. This study aims to develop a Dynamic Bayesian Networks (DBN) model utilizing maritime emergency incident data and compare its forecasting accuracy to Auto-regressive Integrated Moving Average (ARIMA) and Seasonal Auto-regressive Integrated Moving Average (SARIMA) models.
    UNASSIGNED: In this research, we analyzed the count of cases managed by five hospitals in Hainan Province from January 2016 to December 2020 in the context of maritime emergency care. We employed diverse approaches to construct and calibrate ARIMA, SARIMA, and DBN models. These models were subsequently utilized to forecast the number of emergency responders from January 2021 to December 2021. The study indicated that the ARIMA, SARIMA, and DBN models effectively modeled and forecasted Maritime Emergency Medical Service (EMS) patient data, accounting for seasonal variations. The predictive accuracy was evaluated using Mean Absolute Error (MAE), Root Mean Squared Error (RMSE), and Coefficient of Determination (R 2) as performance metrics.
    UNASSIGNED: In this study, the ARIMA, SARIMA, and DBN models reported RMSE of 5.75, 4.43, and 5.45; MAE of 4.13, 2.81, and 3.85; and R 2 values of 0.21, 0.54, and 0.44, respectively. MAE and RMSE assess the level of difference between the actual and predicted values. A smaller value indicates a more accurate model prediction. R 2 can compare the performance of models across different aspects, with a range of values from 0 to 1. A value closer to 1 signifies better model quality. As errors increase, R 2 moves further from the maximum value. The SARIMA model outperformed the others, demonstrating the lowest RMSE and MAE, alongside the highest R 2, during both modeling and forecasting. Analysis of predicted values and fitting plots reveals that, in most instances, SARIMA\'s predictions closely align with the actual number of rescues. Thus, SARIMA is superior in both fitting and forecasting, followed by the DBN model, with ARIMA showing the least accurate predictions.
    UNASSIGNED: While the DBN model adeptly captures variable correlations, the SARIMA model excels in forecasting maritime emergency cases. By comparing these models, we glean valuable insights into maritime emergency trends, facilitating the development of effective prevention and control strategies.
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  • 文章类型: Journal Article
    目标:在线平台已将赌博转变为许多人的日常活动,引起人们对其潜在危害的担忧。值得注意的是,营销策略在影响赌博行为和规范赌博中起着至关重要的作用。本研究旨在探讨博彩业每月营销支出之间的关系,网上投注金额,以及西班牙的在线帐户(活跃和新帐户)数量。第二个目标是评估西班牙皇家法令958/2020对营销和在线赌博行为之间关系的营销限制的影响。
    方法:纵向研究。
    方法:数据涵盖2013年1月至2023年12月。因变量包括:新账户,活跃账户,赌徒存款,和总赌注。独立变量包括:广告支出,奖金,联盟营销,和赞助。采用季节性自回归综合移动平均线(SARIMA)模型来评估营销对在线赌博行为的影响。
    结果:研究结果表明,广告投资(P≤0.025),促销(P<0.001),和赞助(P≤0.004)显着增加了新帐户和活跃帐户的数量,存款,和总赌注。例如,据估计,每投入1欧元奖金和赞助,赌徒将1.6欧元和4欧元存入他们的账户,分别。此外,西班牙规范赌博广告的法律似乎削弱了营销支出和赌博行为之间的联系,除了奖金之外,影响加剧的地方。
    结论:这些结果强调了持续监测和监管西班牙赌博行为的重要性,强调必须严格遵守法规。
    OBJECTIVE: Online platforms have transformed gambling into a daily activity for many, raising concerns about its potential harm. Notably, marketing strategies play a crucial role in influencing gambling behaviors and normalizing gambling. This study aims to explore the relationship between monthly marketing expenditure by the gambling industry, the online amount of money bet, and the number of online accounts (active and new) in Spain. A secondary goal is to assess the impact of marketing restrictions under the Spanish Royal Decree 958/2020 on the relationship between marketing and online gambling behavior.
    METHODS: Longitudinal study.
    METHODS: Data covering January 2013 to December 2023. Dependent variables included: new accounts, active accounts, gambler deposits, and the total money bet. Independent variables included: expenditure on advertising, bonuses, affiliate marketing, and sponsorship. A Seasonal Autoregressive Integrated Moving Average (SARIMA) model was employed to assess marketing\'s impact on online gambling behavior.
    RESULTS: Findings show that investment in advertising (P ≤ 0.025), promotions (P < 0.001), and sponsorships (P ≤ 0.004) significantly increase the number of new and active accounts, deposits, and total money bet. For instance, it has been estimated that, for every €1 invested in bonuses and sponsorship, gamblers deposit €1.6 and €4 into their accounts, respectively. Moreover, the Spanish law regulating gambling advertising has seemingly weakened the link between marketing expenditure and gambling behavior, with the notable exception of bonuses, where the impact has intensified.
    CONCLUSIONS: These results underline the importance of ongoing monitoring and regulation of gambling behavior in Spain, emphasizing the need for strict adherence to regulations.
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  • 文章类型: Journal Article
    梅毒在中国大陆仍然是一个严重的公共卫生问题,需要引起重视,建模来描述和预测其流行模式可以帮助政府制定更科学的干预措施。季节性自回归综合移动平均(SARIMA)模型,长短期记忆网络(LSTM)模型,混合SARIMA-LSTM模型,分别采用具有外源输入的混合SARIMA-非线性自回归模型(SARIMA-NARX)模型对2004年1月至2023年11月的梅毒发病率时间序列数据进行了模拟。与SARIMA相比,LSTM,和SARIMA-LSTM模型,SARIMA-NARX模型的中值绝对偏差(MAD)值下降了352.69%,4.98%,和3.73%,分别。平均绝对百分比误差(MAPE)值下降73.7%,23.46%,和13.06%,分别。均方根误差(RMSE)值下降68.02%,26.68%,23.78%,分别。平均绝对误差(MAE)值下降70.90%,23.00%,和21.80%,分别。混合SARIMA-NARX和SARIMA-LSTM方法比基本的SARIMA和LSTM方法更准确地预测梅毒病例,因此,可以用于政府制定长期的梅毒预防和控制计划。此外,预测病例仍然保持相当高的发病率,因此,迫切需要制定更全面的预防战略。
    Syphilis remains a serious public health problem in mainland China that requires attention, modelling to describe and predict its prevalence patterns can help the government to develop more scientific interventions. The seasonal autoregressive integrated moving average (SARIMA) model, long short-term memory network (LSTM) model, hybrid SARIMA-LSTM model, and hybrid SARIMA-nonlinear auto-regressive models with exogenous inputs (SARIMA-NARX) model were used to simulate the time series data of the syphilis incidence from January 2004 to November 2023 respectively. Compared to the SARIMA, LSTM, and SARIMA-LSTM models, the median absolute deviation (MAD) value of the SARIMA-NARX model decreases by 352.69%, 4.98%, and 3.73%, respectively. The mean absolute percentage error (MAPE) value decreases by 73.7%, 23.46%, and 13.06%, respectively. The root mean square error (RMSE) value decreases by 68.02%, 26.68%, and 23.78%, respectively. The mean absolute error (MAE) value decreases by 70.90%, 23.00%, and 21.80%, respectively. The hybrid SARIMA-NARX and SARIMA-LSTM methods predict syphilis cases more accurately than the basic SARIMA and LSTM methods, so that can be used for governments to develop long-term syphilis prevention and control programs. In addition, the predicted cases still maintain a fairly high level of incidence, so there is an urgent need to develop more comprehensive prevention strategies.
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  • 文章类型: Journal Article
    背景:流感是一种高度传染性的呼吸道疾病,对全球公共卫生提出了重大挑战。因此,有效的流感预测和预防对于及时分配资源至关重要,疫苗策略的发展,以及实施有针对性的公共卫生干预措施。
    方法:在本研究中,我们利用福州2013年1月至2021年12月的历史流感病例数据,建立了四个回归预测模型:SARIMA,先知,Holt-Winters,和XGBoost模型。他们的预测表现是通过使用福州2022年1月至2022年12月期间的流感数据进行评估的。这些模型用于拟合和预测分析。评估指标,包括均方误差(MSE),均方根误差(RMSE),和平均绝对误差(MAE),用于比较这些模型的性能。
    结果:结果表明,福州流感的流行呈现出明显的季节性和周期性。流感病例数据显示出明显的上升趋势和显着波动。在我们的研究中,我们雇佣了SARIMA,先知,Holt-Winters,和XGBoost模型预测福州流感疫情。在这些模型中,XGBoost模型在训练集和测试集上都表现出最佳性能,产生MSE的最低值,RMSE,和MAE在四个模型中。
    结论:利用XGBoost模型可显著提高福州市流感的预测精度。这项研究为流感预测领域做出了有价值的贡献,并为未来的流感应对工作提供了实质性支持。
    BACKGROUND: Influenza is a highly contagious respiratory disease that presents a significant challenge to public health globally. Therefore, effective influenza prediction and prevention are crucial for the timely allocation of resources, the development of vaccine strategies, and the implementation of targeted public health interventions.
    METHODS: In this study, we utilized historical influenza case data from January 2013 to December 2021 in Fuzhou to develop four regression prediction models: SARIMA, Prophet, Holt-Winters, and XGBoost models. Their predicted performance was assessed by using influenza data from the period from January 2022 to December 2022 in Fuzhou. These models were used for fitting and prediction analysis. The evaluation metrics, including Mean Squared Error (MSE), Root Mean Squared Error (RMSE), and Mean Absolute Error (MAE), were employed to compare the performance of these models.
    RESULTS: The results indicate that the epidemic of influenza in Fuzhou exhibits a distinct seasonal and cyclical pattern. The influenza cases data displayed a noticeable upward trend and significant fluctuations. In our study, we employed SARIMA, Prophet, Holt-Winters, and XGBoost models to predict influenza outbreaks in Fuzhou. Among these models, the XGBoost model demonstrated the best performance on both the training and test sets, yielding the lowest values for MSE, RMSE, and MAE among the four models.
    CONCLUSIONS: The utilization of the XGBoost model significantly enhances the prediction accuracy of influenza in Fuzhou. This study makes a valuable contribution to the field of influenza prediction and provides substantial support for future influenza response efforts.
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  • 文章类型: Journal Article
    商业航空旅行可能导致传染病在全球范围内扩散。在2019年冠状病毒病(COVID-19)大流行期间,许多国家实施了边境措施,包括对航空旅行的限制,降低COVID-19的输入风险。在加拿大入境航空旅行的背景下,这项研究旨在:1)描述大流行之前和期间的旅行趋势,2)统计评估大流行期间旅行量和旅行限制之间的关系。
    2017年3月至2023年2月的每月商业航空旅行量数据是从国际航空运输协会(IATA)获得的。到加拿大的国家和机场级别的旅行趋势以入境旅行量为特征,在整个研究期间,提供旅行者的国家数量以及提供旅行者的前10个国家的排名,按六年长的子期分组(三次大流行前和三次大流行)。使用季节性自回归综合移动平均(SARIMA)模型,中断时间序列(ITS)分析通过包括变量来表示时间序列的水平和斜率的变化来评估主要旅行限制与旅行量之间的关联。
    大流行前的入境旅行量在连续的子时段之间增加了3%至7%,有三个季节性高峰(7月至8月,12月-1月,三月)。大流行开始时,旅行量减少了90%,捐助国的数量从大约200个下降到140个,随后数量和季节性恢复缓慢。在大流行期间,提供旅行者的国家排名也出现了明显的中断。ITS分析的结果与旅行限制的时间一致,如下:2020年3月实施时,数量急剧下降,在放松主要限制的同时,从2021年8月授权来自美国的完全接种疫苗的旅行者进入加拿大开始,恰逢旅行量的斜率增加。描述性和统计结果表明,到研究期结束时,大流行前的旅行模式已接近恢复。
    研究结果表明,进入加拿大的商业航空旅行具有弹性。尽管COVID-19大流行导致旅行趋势中断,放宽旅行限制似乎使大流行前的趋势重新出现。了解航空旅行量的趋势,正如这里所展示的,可以提供支持有关传染性病原体输入风险的准备和响应的信息。
    UNASSIGNED: Commercial air travel can result in global dispersal of infectious diseases. During the coronavirus disease 2019 (COVID-19) pandemic, many countries implemented border measures, including restrictions on air travel, to reduce the importation risk of COVID-19. In the context of inbound air travel to Canada, this study aimed to: 1) characterize travel trends before and during the pandemic, and 2) statistically assess the association between travel volumes and travel restrictions during the pandemic.
    UNASSIGNED: Monthly commercial air travel volume data from March 2017 to February 2023 were obtained from the International Air Transport Association (IATA). National and airport-level travel trends to Canada were characterized by inbound travel volumes, the number of countries contributing travellers and the ranking of the top ten countries contributing travellers across the study period, by six year-length subperiod groupings (three pre-pandemic and three pandemic). Using seasonal autoregressive integrated moving average (SARIMA) models, interrupted time series (ITS) analyses assessed the association between major travel restrictions and travel volumes by including variables to represent changes to the level and slope of the time series.
    UNASSIGNED: The pre-pandemic inbound travel volume increased by 3% to 7% between consecutive subperiods, with three seasonal peaks (July-August, December-January, March). At the onset of the pandemic, travel volume decreased by 90%, with the number of contributing countries declining from approximately 200 to 140, followed by a slow recovery in volume and seasonality. A disruption in the ranking of countries that contributed travellers was also noticeable during the pandemic. Results from the ITS analysis aligned with the timing of travel restrictions as follows: implementation in March 2020 coincided with a sharp reduction in volumes, while the easing of major restrictions, starting with the authorization of fully vaccinated travellers from the United States to enter Canada in August 2021, coincided with an increase in the slope of travel volumes. Descriptive and statistical results suggest a near-return of pre-pandemic travel patterns by the end of the study period.
    UNASSIGNED: Study results suggest resilience in commercial air travel into Canada. Although the COVID-19 pandemic led to a disruption in travel trends, easing of travel restrictions appeared to enable pre-pandemic trends to re-emerge. Understanding trends in air travel volumes, as demonstrated here, can provide information that supports preparedness and response regarding importation risk of infectious pathogens.
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  • 文章类型: Journal Article
    鉴于最近的全球动荡,包括油价波动,俄罗斯-乌克兰冲突,这项研究深入研究了COVID-19大流行对全球食品进出口动态的深远影响。主粮价格上涨让人想起2010-2011年全球粮食危机,全面了解这些转变势在必行。
    我们的目标是通过检查六个独立变量(年,月,布伦特原油,COVID-19,俄罗斯-乌克兰冲突)以及六个食品指标作为因变量。采用皮尔逊的相关性,线性回归,和季节性自回归综合移动平均线(SARIMA),我们仔细检查这些变量之间的复杂关系。
    我们的发现揭示了不同程度的关联,尤其突出了布伦特原油和食品指标之间的强劲相关性。线性回归分析表明,俄乌冲突有积极影响,布伦特石油对食品价格指数,和COVID-19。此外,整合SARIMA提高了预测准确性,提供对未来预测的见解。
    最后,这项研究在为全球食品定价的复杂动态提供有价值的分析方面发挥了重要作用,为全球挑战中的决策提供信息,并弥合先前关于预测食品价格指数的研究中的关键差距。
    UNASSIGNED: Light of recent global upheavals, including volatile oil prices, the Russo-Ukrainian conflict, and the COVID-19 pandemic this study delves into their profound impact on the import and export dynamics of global foodstuffs. With rising staple food prices reminiscent of the 2010-2011 global food crisis, understanding these shifts comprehensively is imperative.
    UNASSIGNED: Our objective is to evaluate this impact by examining six independent variables (year, month, Brent crude oil, COVID-19, the Russo-Ukrainian conflict) alongside six food indicators as dependent variables. Employing Pearson\'s correlation, linear regression, and seasonal autoregressive integrated moving averages (SARIMA), we scrutinize intricate relationships among these variables.
    UNASSIGNED: Our findings reveal varying degrees of association, notably highlighting a robust correlation between Brent crude oil and food indicators. Linear regression analysis suggests a positive influence of the Russo-Ukrainian conflict, Brent oil on food price indices, and COVID-19. Furthermore, integrating SARIMA enhances predictive accuracy, offering insights into future projections.
    UNASSIGNED: Finally, this research has a significant role in providing a valuable analysis into the intricate dynamics of global food pricing, informing decision-making amidst global challenges and bridging critical gaps in prior research on forecasting food price indices.
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  • 文章类型: Journal Article
    背景:呼吸道合胞病毒(RSV)是大多数婴儿急性下呼吸道感染的原因,也可以影响年龄较大的人群。与SARS-CoV-2大流行的出现及其随后的解除有关的限制导致RSV循环动态的变化。因此,监测RSV季节性趋势并能够预测其季节性峰值以准备下一次RSV流行是至关重要的。
    方法:我们于2018年1月1日至2022年12月31日对罗马BambinoGesu儿童医院的实验室确诊RSV感染进行了回顾性描述性研究。分析了0-18岁患者的RSV阳性呼吸道样本(n=3,536)和RSV确认住院(n=1,895)的数据。除此之外,建立了SARIMA(季节性自回归综合移动平均)预测模型来预测下一个RSV峰值。
    结果:研究结果表明,在2020年SARS-CoV-2大流行季节之后,RSV循环几乎没有,与大流行前季节相比,RSV感染呈现增加和预期的高峰。虽然主要针对1岁以下的婴儿,在大流行后期间,年龄较大的人群中RSV感染和住院治疗呈比例增加.使用2018年至2022年的RSV每周数据建立的预测模型预测了2023年的RSV峰值,显示出合理的准确性(MAPE33%)。另外的分析表明,预期从病例加倍起4-5周后达到RSV病例的峰值。
    结论:我们的研究提供了关于COVID-19大流行前后RSV循环动态的流行病学证据。我们的发现强调了将监测和预测相结合以促进对下一次RSV流行的准备的潜力。
    BACKGROUND: Respiratory Syncytial Virus (RSV) is responsible for the majority of acute lower respiratory infections in infants and can affect also older age groups. Restrictions linked to the emergence of the SARS-CoV-2 pandemic and their subsequent lifting caused a change in the dynamics of RSV circulation. It is therefore fundamental to monitor RSV seasonal trends and to be able to predict its seasonal peak to be prepared to the next RSV epidemics.
    METHODS: We performed a retrospective descriptive study on laboratory-confirmed RSV infections from Bambino Gesù Children\'s Hospital in Rome from 1st January 2018 to 31st December 2022. Data on RSV-positive respiratory samples (n = 3,536) and RSV-confirmed hospitalizations (n = 1,895) on patients aged 0-18 years were analyzed. In addition to this, a SARIMA (Seasonal AutoRegressive Integrated Moving Average) forecasting model was developed to predict the next peak of RSV.
    RESULTS: Findings show that, after the 2020 SARS-CoV-2 pandemic season, where RSV circulation was almost absent, RSV infections presented with an increased and anticipated peak compared to pre-pandemic seasons. While mostly targeting infants below 1 year of age, there was a proportional increase in RSV infections and hospitalizations in older age groups in the post-pandemic period. A forecasting model built using RSV weekly data from 2018 to 2022 predicted the RSV peaks of 2023, showing a reasonable level of accuracy (MAPE 33%). Additional analysis indicated that the peak of RSV cases is expected to be reached after 4-5 weeks from case doubling.
    CONCLUSIONS: Our study provides epidemiological evidence on the dynamics of RSV circulation before and after the COVID-19 pandemic. Our findings highlight the potential of combining surveillance and forecasting to promote preparedness for the next RSV epidemics.
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  • 文章类型: Journal Article
    电动汽车(EV)是汽车行业的未来,因为它们产生零排放,并解决了传统燃料燃料燃料车辆造成的环境和健康问题。随着越来越多的人转向电动汽车,对充电站进行有效管理的需求越来越大。预测功耗可以帮助优化操作,防止网格过载,和停电,并协助公司估计满足需求所需的充电站数量。本文采用三种时间序列模型对充电站的用电需求进行预测,而SARIMA(季节性自回归综合移动平均)模型优于ARMA(自回归综合移动平均)和ARIMA(自回归综合移动平均)模型,具有最小的RMSE(均方根误差),预测电力需求和收入的MAE(平均绝对误差)和MAPE(平均绝对误差百分比)得分。用于验证的数据包括科罗拉多州公共充电网点在四年内的充电活动,来自喀拉拉邦ChargeMOD公共充电终端的六个月充电数据,印度。还根据车辆的车轮预测功率使用,最后,来自同一来源的计划订阅数据用于预测收入,这有助于公司制定定价策略,以在保持竞争力的同时最大化利润。公用事业公司和充电网络可以出于各种目的使用准确的功耗预测,例如电力调度和确定充电站的预期能量需求。最终,精确的用电量预测可以帮助电动汽车充电基础设施的有效规划和设计。这项研究的主要目的是创建一个良好的时间序列模型,可以估计电动汽车充电站的功率使用情况,并验证公司是否有良好的收入以及一些准确性措施。结果表明,SARIMA模型在为我们提供准确信息方面起着至关重要的作用。根据这里的数据和研究,四轮车比两轮和三轮车使用更多的动力。此外,直流充电设施比交流充电站使用更多的电力。这些结果可用于确定运营电动汽车及其订阅的成本。
    Electric vehicles (EVs) are the future of the automobile industry, as they produce zero emissions and address environmental and health concerns caused by traditional fuel-poared vehicles. As more people shift towards EVs, the demand for power consumption forecasting is increasing to manage the charging stations effectively. Predicting power consumption can help optimize operations, prevent grid overloading, and power outages, and assist companies in estimating the number of charging stations required to meet demand. The paper uses three time series models to predict the electricity demand for charging stations, and the SARIMA (Seasonal Auto Regressive Integrated Moving Average) model outperforms the ARMA (Auto Regressive Moving Average) and ARIMA (Auto Regressive Integrated Moving Average) models, with the least RMSE (Root Mean Squared Error), MAE (Mean Absolute Error) and MAPE (Mean Absolute Percentage Error) scores in forecasting power demand and revenue. The data used for validation consists of charging activities over a four-year period from public charging outlets in Colorado, six months of charging data from ChargeMOD\'s public charging terminals in Kerala, India. Power usage is also forecasted based on wheels of vehicles, and finally, a plan subscription data from the same source is utilized to anticipate income, that helps companies develop pricing strategies to maximize profits while remaining competitive. Utility firms and charging networks may use accurate power consumption forecasts for a variety of purposes, such as power scheduling and determining the expected energy requirements for charging stations. Ultimately, precise power consumption forecasting can assist in the effective planning and design of EV charging infrastructure. The main aim of this study is to create a good time series model which can estimate the electric vehicle charging stations usage of power and verify if the firm has a good income along with some accuracy measures. The results show that SARIMA model plays a vital role in providing us with accurate information. According to the data and study here, four wheelers use more power than two and three wheelers. Also, DC charging facility uses more electricity than AC charging stations. These results can be used to determine the cost to operate the EVs and its subscriptions.
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  • 文章类型: Journal Article
    背景:公共卫生准备工作基于及时和准确的信息。使用疾病监测数据进行时间序列预测是准备工作的一个重要方面。这项研究比较了两种时间序列预测方法:季节性自回归综合移动平均(SARIMA)建模和人工神经网络(ANN)算法。目标是使用SARIMA对加拿大的每周季节性流感活动进行建模,并比较其预测准确性。基于均方根预测误差(RMSE)和平均绝对预测误差(MAE),一个ANN的。
    方法:使用自动模型选择通过最小化Akaike信息标准(AIC)来拟合初始SARIMA模型。对自相关函数和部分自相关函数的进一步检查导致\'手动\'模型改进。神经网络进行了迭代训练,使用自动化过程来最小化RMSE和MAE。
    结果:从2010-2011流感季节到2019-2020流感季节结束,加拿大共报告了378,462例流感病例,平均年发病率风险为每100,000人20.02。就预测准确性而言,自动SARIMA建模是更好的方法(根据RMSE和MAE)。然而,ANN正确预测了疾病发病率的峰值周,而其他模型则没有。
    结论:ANN和SARIMA模型都已证明是预测加拿大季节性流感活动的有效工具。结果表明,两者串联应用是有益的,SARIMA更好地预测了总体发病率,而ANN正确地预测了峰值周。
    BACKGROUND: Public health preparedness is based on timely and accurate information. Time series forecasting using disease surveillance data is an important aspect of preparedness. This study compared two approaches of time series forecasting: seasonal auto-regressive integrated moving average (SARIMA) modelling and the artificial neural network (ANN) algorithm. The goal was to model weekly seasonal influenza activity in Canada using SARIMA and compares its predictive accuracy, based on root mean square prediction error (RMSE) and mean absolute prediction error (MAE), to that of an ANN.
    METHODS: An initial SARIMA model was fit using automated model selection by minimizing the Akaike information criterion (AIC). Further inspection of the autocorrelation function and partial autocorrelation function led to \'manual\' model improvements. ANNs were trained iteratively, using an automated process to minimize the RMSE and MAE.
    RESULTS: A total of 378, 462 cases of influenza was reported in Canada from the 2010-2011 influenza season to the end of the 2019-2020 influenza season, with an average yearly incidence risk of 20.02 per 100,000 population. Automated SARIMA modelling was the better method in terms of forecasting accuracy (per RMSE and MAE). However, the ANN correctly predicted the peak week of disease incidence while the other models did not.
    CONCLUSIONS: Both the ANN and SARIMA models have shown to be capable tools in forecasting seasonal influenza activity in Canada. It was shown that applying both in tandem is beneficial, SARIMA better forecasted overall incidence while ANN correctly predicted the peak week.
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  • 文章类型: Journal Article
    肾综合征出血热(HFRS)是危害人类健康的十大传染病之一,分布于全球30多个国家。中国是全球报告HFRS病例最多的国家,占全球病例的90%。衢州市HFRS发病水平居浙江省前列,目前还没有具体的治疗方法。因此,掌握衢州市HFRS的流行病学特征,建立HFRS预测模型,为HFRS的预警奠定基础。
    采用描述性流行病学方法分析HFRS的流行特征,发病图由ArcGIS软件绘制,利用R软件建立季节自回归综合移动平均(SARIMA)和Prophet模型。然后,均方根误差(RMSE)和平均绝对误差(MAE)用于评估模型的拟合和预测性能。
    2005-2022年衢州市报告HFRS病例843例,其中2007年发病率最高(3.93/10万),2022年发病率最低(1.05/10万)(P<0.001)。发病率呈季节性双峰分布,第一个高峰从10月到1月,第二个高峰从5月到7月。男性发病率(2.87/100,000)明显高于女性(1.32/100,000)。农民的病例最多,占病例总数的79.95%。衢州市西北部高发,案件集中在耕地和人工土地上。Prophet模型的RMSE和MAE值小于SARIMA(1,0,1)(2,1,0)12模型的RMSE和MAE值。
    2005-2022年,衢州市HFRS发病率总体呈下降趋势,但是高发地区的疫情仍然严重。在未来,应结合Prophet模型,不断加强HFRS暴发和宿主动物监测的动态。在旺季,以农民为重点群体,促进HFRS疫苗接种和健康教育。
    Hemorrhagic fever with renal syndrome (HFRS) is one of the 10 major infectious diseases that jeopardize human health and is distributed in more than 30 countries around the world. China is the country with the highest number of reported HFRS cases worldwide, accounting for 90% of global cases. The incidence level of HFRS in Quzhou is at the forefront of Zhejiang Province, and there is no specific treatment for it yet. Therefore, it is crucial to grasp the epidemiological characteristics of HFRS in Quzhou and establish a prediction model for HFRS to lay the foundation for early warning of HFRS.
    Descriptive epidemiological methods were used to analyze the epidemic characteristics of HFRS, the incidence map was drawn by ArcGIS software, the Seasonal AutoRegressive Integrated Moving Average (SARIMA) and Prophet model were established by R software. Then, root mean square error (RMSE) and mean absolute error (MAE) were used to evaluate the fitting and prediction performances of the model.
    A total of 843 HFRS cases were reported in Quzhou City from 2005 to 2022, with the highest annual incidence rate in 2007 (3.93/100,000) and the lowest in 2022 (1.05/100,000) (P trend<0.001). The incidence is distributed in a seasonal double-peak distribution, with the first peak from October to January and the second peak from May to July. The incidence rate in males (2.87/100,000) was significantly higher than in females (1.32/100,000). Farmers had the highest number of cases, accounting for 79.95% of the total number of cases. The incidence is high in the northwest of Quzhou City, with cases concentrated on cultivated land and artificial land. The RMSE and MAE values of the Prophet model are smaller than those of the SARIMA (1,0,1) (2,1,0)12 model.
    From 2005 to 2022, the incidence of HFRS in Quzhou City showed an overall downward trend, but the epidemic in high-incidence areas was still serious. In the future, the dynamics of HFRS outbreaks and host animal surveillance should be continuously strengthened in combination with the Prophet model. During the peak season, HFRS vaccination and health education are promoted with farmers as the key groups.
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