Quasi Maximum Likelihood for MESS Varying Coefficient Panel Data Models with Fixed Effects

The study of spatial econometrics has developed rapidly and has found wide applications in many different scientific fields,such as demog­raphy,epidemiology,regional economics,and psychology.With the deepening of research,some scholars find that there are some model specifications in spatial econometrics,such as spatial autoregressive(SAR)model and matrix exponential spatial specification(MESS),which cannot be nested within each other.Compared with the common SAR models,the MESS models have computational advantages because it eliminates the need for logarithmic determinant calculation in maxi­mum likelihood estimation and Bayesian estimation.Meanwhile,MESS models have theoretical advantages.However,the theoretical research and application of MESS models have not been promoted vigorously.Therefore,the study of MESS model theory has practical significance.This paper studies the quasi maximum likelihood estimation for ma­trix exponential spatial specification(MESS)varying coefficient panel data models with fixed effects.It is shown that the estimators of model parameters and function coefficients satisfy the consistency and asymp­totic normality to make a further supplement for the theoretical study of MESS model.

A comparison of the short-term effects of fixed platform versus rotating high-fiexion prosthesis for the patients with osteoarthrities of knee

Objective To compare the preliminary clinical outcome between fixed platform and rotating high-flexion prosthesis following total knee replacement(TKR).Methods Form January 2007 to December 2009,68 patients with osteoarthritis of

数字普惠金融对企业数字化转型的影响——基于A股上市公司的研究

数字普惠金融对企业数字化发挥引导和促转作用。本文将数字普惠金融2013~2023年市级数据与中国上市企业数据进行匹配,深入研究数字普惠金融对企业数字化转型的影响。研究发现:数字普惠金融的发展对企业数字化转型有显著驱动作用,二者之间的非线性影响存在门槛效应,这种作用在非国有企业、小型企业和高科技企业中更为明显。进一步研究二者之间的传导机制,发现数字普惠金融通过3个渠道助力企业数字化转型:缓解融资约束、优化金融错配、加大研发投入。据此,本文提出了数字普惠金融服务实体经济促进企业数字化转型的政策建议。

数字化转型赋能企业绿色技术创新的影响研究——基于中国上市公司的经验数据

在“双碳”目标背景下,企业通过数字化转型推动绿色技术创新,这不仅关乎其自身生存发展,也是促进中国经济可持续发展的微观基础。本文基于2009~2023年沪深A股上市公司数据,实证检验数字化转型对企业绿色技术创新的影响。研究发现:(1)数字化转型有助于提升企业绿色技术创新水平,且估计结果十分稳健;(2)数字化转型通过增强内部能力、提高外部市场关注和增加政府补贴促进企业绿色技术创新;(3)异质性分析表明,在国有企业和环境规制强度高的区域,数字化转型对企业绿色技术创新的推动作用更为显著。本文为理解数字化转型赋能企业绿色技术创新提供经验证据,并为我国推动数字化转型以促进经济可持续发展提供理论和实践参考。

Estimation in Nonlinear Models with Random Effects

A necessary condition for existence of any weakly consistent estimator is presented in nonlinear models with random effects. Under mild regularity conditions, the strong consistency and the asymptotic normality of the estimator are proved. The results of Breslow and Calyton(1993), Lee and Nelder(1996) are improved.

基于Fix平台电厂电气监控系统的开发

介绍了Fix工业组态软件的概况、功能,并以电厂电气监控系统的设计为背景,详细介绍了Fix的具体应用及其应用效果。

Fixed-effect and random-effects models in meta-analysis

A systematic review synthesizes evidence addressing a structured clinical question using systematic and explicit methods to search,identify,screen,critically appraise,and extract and analyze data from relevant studies.[1]A meta-analysis,on the other hand,is a statistical method that combines the quantitative results of available primary studies addressing the same question to generate a pooled summary estimate and confidence interval(CI).[2]Meta-analyses can increase statistical power,enhance precision,and answer questions that single trials are underpowered to address.Although there are systematic reviews where meta-analyses are not appropriate,when they are well-conducted and reported,systematic reviews combined with meta-analyses provide valuable information for clinicians,researchers,and policymakers.

FinFET静电可靠性及新型Fix-base SOI FinFET研究

在鳍型场效应晶体管(SOI FinFET)相关静电防护技术研究基础上,提出了一种新型的体区接触固定型绝缘体上硅鳍型场效应晶体管泄放钳位装置(Fix-base SOI FinFET Clamp)。该新型结构的器件解决了基区接触浮空在静电防护设计时引起的一系列问题,而且对正常的FinFET工艺具有良好的兼容性。通过计算机辅助工艺设计(TCAD)仿真论证了Fix-base SOI FinFET Clamp具有明显效果,详细阐述和讨论了SOI FinFET和Fix-base SOI FinFET Clamp工作状态下的电流和热分布。

Empirical Study on the Effect of Abolishing Agricultural Tax on Farmers' Income

The panel dataset which covered the socio-economic data of 31 provinces （municipalities and autonomous region） in China from 2000-2007 was used to do empirical analysis on the effect of abolishing agricultural taxes on farmers＇ income by referring to the fixed effect estimation method. It found that the abolition of agricultural taxes increased farmer＇s net income per capita by 2%. Combining with the results of empirical analysis, related policy suggestions were put forward to increase farmers＇ income.

INFLUENCE ANALYSIS IN NONLINEAR MODELS WITH RANDOM EFFECTS

In this paper,a unified diagnostic method for the nonlinear models with random effects based upon the joint likelihood given by Robinson in 1991 is presented.It is shown that the case deletion model is equivalent to the mean shift outlier model.From this point of view,several diagnostic measures,such as Cook distance,score statistics are derived.The local influence measure of Cook is also presented. A numerical example illustrates that the method is available.

INFLUENCE ANALYSIS ON EXPONENTIAL NONLINEAR MODELS WITH RANDOM EFFECTS

This paper presents a unified diagnostic method for exponential nonlinear models with random effects based upon the joint likelihood given by Robinson in 1991. The authors show that the case deletion model is equivalent to mean shift outlier model. From this point of view, several diagnostic measures, such as Cook distance, score statistics are derived. The local influence measure of Cook is also presented. Numerical example illustrates that our method is available.

Evaluation of Economic, Social Effects of Renewable Energy Technologies

What is sustainability? Does it only concern the environment or even socio-economic policies? It is only a question of ethics or a redefinition of industrial policy oriented towards the use of renewable energy, it can bring benefits both atmospheric and social employment. The need for the development of renewable sources can be in tune with the correct management of the territory in consideration of the fact that these sources involve the widespread implementation of small and medium-sized plants. A model of economic development based on renewable sources should respect the peculiarities and characteristics of the territories involved. It should also think of the territory as a “value” to be strengthened and used in a sustainable and integrated way and no longer as a passive platform on which to install plants. Solar thermal and photovoltaic, biomass, geothermal, hydrological, wind power are some of the sources the various countries must constantly invest. This publication is based on these concepts starting from an analysis of the employment data of the OECD “Organisation for Economic Co-operation and Development countries”, comparing them successively with the results of renewable energy productivity. The analysis was performed by analyzing a sample of 22 countries over a period of 20 years, after which the regression curve for the variables with the OLS method was created. This econometric method has allowed us to analyze the impact that renewable technologies have on the parameters of social welfare and in particular on unemployment.

自体纤维血凝块移植联合关节镜下FasT-Fix修复手术对半月板撕裂患者的治疗效果分析

目的:分析自体纤维血凝块移植联合关节镜下FasT-Fix修复手术对半月板撕裂患者的治疗效果。方法:回顾性分析2019年2月至2021年2月我院收治的145例半月板撕裂患者临床资料,按照手术方式分为观察组74例和对照组71例,对照组予以关节镜下FasT-Fix修复手术,观察组行自体纤维血凝块移植联合关节镜下FasT-Fix修复手术,比较两组患者治疗前后膝关节功能(IKDC)、疼痛(VAS)、Lysholm以及膝关节运动(Tegner)评分,预后状况以及不良反应的发生状况。结果:两组治疗前后差值比较,观察组Lysholm及Tegner评分升高幅度均大于对照组(P<0.05),观察组VAS评分降低幅度大于对照组(P<0.05),IKDC升高幅度均高于对照组(P<0.05);观察组患者不良反应的发生率为2.70%明显低于对照组的11.27%,(P<0.05);观察组患者半月板愈合状况优于对照组(P<0.05)。结论:自体纤维血凝块移植联合治疗较单纯关节镜下FasT-Fix修复手术治疗更有利于提高半月板撕裂患者的Lysholm、Tegner及IKDC评分,降低VAS评分,同时降低不良反应的发生率,促进半月板的愈合。

GeneFlex、GyneFix和Tcu380A三种IUD的比较性临床研究

目的研究GeneFlex(吉妮舒适型)IUD的避孕效果和副反应。方法对300例放置GeneFlex(吉妮舒适型)、GyneFix(吉妮IN型)和Tcu380A三种IUD的妇女进行12个月的临床观察和对照研究。结果GeneFlex(吉妮舒适型)IUD在副反应率和因症停用率上明显低于GyneFix(吉妮IN型)和Tcu380AIUD(P<0.05)。结论GeneFlex(吉妮舒适型)IUD安全、副作用小、避孕效果好,更适用于放置传统IUD后反复下移脱落、疼痛、经量明显增多、不规则出血的妇女,是一种值得推广的新型IUD。

微创FasT-Fix缝合器治疗膝关节半月板损伤的疗效分析

目的分析观察微创FasT-Fix缝合器治疗膝关节半月板损伤的临床疗效。方法选择笔者所在医院于2016年2月至2018年11月收治的48例膝关节半月板损伤患者作为本次研究的对象,所有患者均给予微创FasT-Fix缝合器治疗,观察分析临床治疗效果。结果①本组48例患者,25例优,17例良,5例可,1例差,优良率为87.5%(42/48)。②治疗前,48例患者Lysholm评分为(47.51±14.59)分,治疗后增加到(83.45±11.97)分,治疗前后差异显著,有统计学意义(P<0.05)。③48例患者中,无1例出现切口感染、血管神经损伤等并发症。结论微创FasT-Fix缝合器治疗膝关节半月板损伤,疗效确切,安全性高,操作简单,值得临床推广借鉴。

PIECEWISE CONTINUOUS SOLUTIONS OF INITIAL VALUE PROBLEMS OF SINGULAR FRACTIONAL DIFFERENTIAL EQUATIONS WITH IMPULSE EFFECTS

Results on the existence of piecewise continuous solutions for two classes of initial value problems of impulsive singular fractional differential equations are obtained.

Bootstrap inference of the skew-normal two-way classification random effects model with interaction

In this paper,we consider the statistical inference problems for the fixed effect and variance component functions in the two-way classification random effects model with skewnormal errors.Firstly,the exact test statistic for the fixed effect is constructed.Secondly,using the Bootstrap approach and generalized approach,the one-sided hypothesis testing and interval estimation problems for the single variance component,the sum and ratio of variance components are discussed respectively.Further,the Monte Carlo simulation results indicate that the exact test statistic performs well in the one-sided hypothesis testing problem for the fixed effect.And the Bootstrap approach is better than the generalized approach in the one-sided hypothesis testing problems for variance component functions in most cases.Finally,the above approaches are applied to the real data examples of the consumer price index and value-added index of three industries to verify their rationality and effectiveness.

Dynamic Analysis of Soil Structure Interaction Effect on Multi Story RC Frame

In this study dynamic analysis of Soil Structure Interaction (SSI) effect on multi story reinforced concrete (RC) frame founded on soft soil (flexible base) is made and compared with fixed base. Two model 2D RC frames with 7 and 12 story are selected for analysis. Winkler Spring and half space direct method models are used for flexible base for the frames founded on two types of soft soils with shear velocity Vs < 150 m/s Asper Seismic Codes of Chinese GB50011-2010 Soil IV and Ethiopian ES8-2015 soil D. The frames are subjected to strong ground motion matched to response spectrums of soft soil of Chinese GB50011-2010 and Ethiopian ES8-2015 for linear time history analysis. The dynamic analysis result shows Spring and Fixed base mass participation 90% reaches in 2 or 3 modes but in direct method 11 to 30 modes for story 12 and 7 respectively. However, both flexible base models have bigger fundamental period of vibration and inter story drift but smaller base shear than fixed base. In addition, within the flexible base models the inter-story drift, second order effect (P-Δ) and Story shear distribution are different along the height of frames. The spring model shows larger Story drift and second order effect (P-Δ) at the bottom of Story for both soft soils types. On the other hand, half space direct method model indicates value reverse to spring model;it gives bigger Story drift and P-Δ effect in the top stories than fixed base. Finally, this study concludes that base shear reduction due to SSI may not be always beneficial. Because the gravity load is constant in both fixed and flexible bases that cause bigger P-Δ effect at the bottom stories due to increase, inter story drift and decrease story shear in flexible base.

数字经济对生态效率的非线性影响--基于门槛效应的检验

数字经济与生态环境是关乎中国式现代化发展的重要议题。本文从数字产业化与产业数字化两个维度,运用熵权法对中国30个省(区、市)2011—2021年数字经济发展水平进行测度,并利用双向固定效应、门槛效应等方法实证分析了数字经济对生态效率的影响。研究发现:数字经济显著促进了生态效率的提升,且这一结论通过了工具变量法、调整样本期和改变模型设定等稳健性检验;数字经济对生态效率的促进效应具有非线性关系,存在以数字经济、环境规制强度为门槛变量的单一门槛效应;进一步的异质性分析表明,数字经济对生态效率的促进效应、单一门槛效应以及“边际效应”递增的非线性特征在南方地区和不同数字经济维度下显著。最后,根据研究结论就如何发展数字经济提升生态效率的路径提出政策建议。

数字经济发展促进产业结构转型升级的实证研究

从理论上来说,数字经济发展通过影响产业间结构转变、产业内劳动生产率提升和产业资源配置效率提高等方式来促进产业结构转型升级。文章以我国247个地级及以上城市2016—2019年的数据为例,采用固定效应模型分析数字经济发展对产业结构转型升级的影响。实证结果发现:数字经济发展对第一维度、第二维度和第三维度产业结构转型升级均具有显著的促进作用,子样本数据的实证结果和采取替代变量的实证结果均支持这一研究结论;在控制内生性问题后,研究结论依然成立。进一步的机制检验发现,数字经济发展主要通过消费升级效应和技术外溢效应两种途径促进产业结构转型升级。