近年来,拓扑数据分析(Topological Data Analysis,TDA)在金融领域的应用逐渐显现出价值。TDA通过持久同调等方法构建复形,能有效量化数据的形状,以便提取数据信息,为时间序列分析,特别是金融时间序列的聚类与投资组合的构建提供了独特...近年来,拓扑数据分析(Topological Data Analysis,TDA)在金融领域的应用逐渐显现出价值。TDA通过持久同调等方法构建复形,能有效量化数据的形状,以便提取数据信息,为时间序列分析,特别是金融时间序列的聚类与投资组合的构建提供了独特优势。基于此,通过采用TDA方法对中国股票市场的时间序列数据进行深入挖掘,结合聚类算法,并将其应用于投资组合的构建,分析其有效性。通过滑动窗口法进行验证,结果表明基于TDA(去噪)聚类的投资组合在回报风险比和稳定性方面表现良好,优于市场整体表现。研究表明,TDA方法可以更有效地挖掘股票数据中的信息,为投资者提供科学依据,从而取得最佳收益。展开更多
OBJECTIVE:To systematically review and analyze the effect of acupuncture and acupoint catgut embedding in treatment of abdominal obesity to provide a more reasonable clinical treatment regimen.METHODS:Ten databases we...OBJECTIVE:To systematically review and analyze the effect of acupuncture and acupoint catgut embedding in treatment of abdominal obesity to provide a more reasonable clinical treatment regimen.METHODS:Ten databases were searched as of August 2022:the English databases Pub Med,Embase,Cochrane Library,Web of Science,Wiley,and Scopus and the Chinese databases China National Knowledge Infrastructure Database,China Science and Technology Journal Database,Wanfang,and Sino Med/Chinese Biomedical Literature Database.Randomized controlled trials(RCTs)of acupuncture and acupoint catgut embedding as the main interventions to treat abdominal obesity were extracted.The investigators imported the citations into End Note version X9.1 for deduplication,screening,extraction,and integration.The risk of bias in the included RCTs was assessed according to the Cochrane Handbook.Rev Man 5.4 software was used to conduct a Meta-analysis of RCTs that met the inclusion criteria.RESULTS:Thirteen RCTs(1069 patients)were included in this study,and the data of eleven RCTs(966 patients)were include in the Meta-analysis.The results showed that acupoint catgut embedding can significantly change the weight and waist circumference of patients with abdominal obesity when compared to sham acupuncture or no treatment[mean difference(MD)=2.32,95%confidence interval(CI)(1.88,2.76),P<0.00001],[MD=3.47,95%CI(1.99,4.94),P<0.00001].The change in hip circumference after acupuncture was also significant[MD=0.89,95%CI(0.12,1.66),P=0.02].CONCLUSION:This study found that acupuncture and acupoint catgut embedding can effectively treat abdominal obesity,therefore,these interventions can be used as clinical supplements and alternative therapies.The diagnostic criteria of the existing studies and the intervention measures of the control group are not unified.It will be necessary to improve the clinical study protocols and expand the sample size to further validate the reliability of the results obtained of this study.展开更多
文摘近年来,拓扑数据分析(Topological Data Analysis,TDA)在金融领域的应用逐渐显现出价值。TDA通过持久同调等方法构建复形,能有效量化数据的形状,以便提取数据信息,为时间序列分析,特别是金融时间序列的聚类与投资组合的构建提供了独特优势。基于此,通过采用TDA方法对中国股票市场的时间序列数据进行深入挖掘,结合聚类算法,并将其应用于投资组合的构建,分析其有效性。通过滑动窗口法进行验证,结果表明基于TDA(去噪)聚类的投资组合在回报风险比和稳定性方面表现良好,优于市场整体表现。研究表明,TDA方法可以更有效地挖掘股票数据中的信息,为投资者提供科学依据,从而取得最佳收益。
基金Supported by National Key Research and Development Project:Clinical Evaluation of the Interventional Techniques for Abdominal Obesity(No.2019YFC1710102)。
文摘OBJECTIVE:To systematically review and analyze the effect of acupuncture and acupoint catgut embedding in treatment of abdominal obesity to provide a more reasonable clinical treatment regimen.METHODS:Ten databases were searched as of August 2022:the English databases Pub Med,Embase,Cochrane Library,Web of Science,Wiley,and Scopus and the Chinese databases China National Knowledge Infrastructure Database,China Science and Technology Journal Database,Wanfang,and Sino Med/Chinese Biomedical Literature Database.Randomized controlled trials(RCTs)of acupuncture and acupoint catgut embedding as the main interventions to treat abdominal obesity were extracted.The investigators imported the citations into End Note version X9.1 for deduplication,screening,extraction,and integration.The risk of bias in the included RCTs was assessed according to the Cochrane Handbook.Rev Man 5.4 software was used to conduct a Meta-analysis of RCTs that met the inclusion criteria.RESULTS:Thirteen RCTs(1069 patients)were included in this study,and the data of eleven RCTs(966 patients)were include in the Meta-analysis.The results showed that acupoint catgut embedding can significantly change the weight and waist circumference of patients with abdominal obesity when compared to sham acupuncture or no treatment[mean difference(MD)=2.32,95%confidence interval(CI)(1.88,2.76),P<0.00001],[MD=3.47,95%CI(1.99,4.94),P<0.00001].The change in hip circumference after acupuncture was also significant[MD=0.89,95%CI(0.12,1.66),P=0.02].CONCLUSION:This study found that acupuncture and acupoint catgut embedding can effectively treat abdominal obesity,therefore,these interventions can be used as clinical supplements and alternative therapies.The diagnostic criteria of the existing studies and the intervention measures of the control group are not unified.It will be necessary to improve the clinical study protocols and expand the sample size to further validate the reliability of the results obtained of this study.
