新兴股票市场有效性及诚实性检验方法和实证分析   总被引：4，自引：0，他引：4  

张曼  屠梅曾 《预测》2001,20(1):71-74

本文介绍了新兴股票市场有效性及诚实性检验方法，通过检验上市公司新发布的公告是否能引起股市交易量的增加和收益率的波动量增加来检验股票市场的有效性及是否存在内部交易的问题。如果在公告发布期间股市没有任何异常变动，市场可能是效率低下的或是存在内部交易。如果进一步分析能够证实在同一公司发布的针对不同持有群体的股票之间,如A股和B股或H股之间，存在滞后的引导关系，则可以基本判定股市存在内部交易。Utpa Bhattacharya已经对墨西哥的Bolsa Mexicana de Valores市场做过类似的研究并且发现该股票市场存在内部交易。本文对中国的股票市场进行研究。结果表明中国股市不存在明显的内部交易，但同时也发现中国股市的A股和B股市场之间的联动性较弱，中国股市有效性较差，尤其是B股市场对市场信息公告的反映很不明显。这些都在一定程度上反映了中国股市作为成长中的股市发展还不成熟，B股市场的发展尤其需要进一步努力。  相似文献   

Operating characteristics of hyperbolically and elliptically constrained self-adaptive incremental newton—raphson algorithms     

Joseph Padovan  Surapong Tovichakchikul  Tomas Arechaga 《Journal of The Franklin Institute》1983,316(3):197-223

To improve the versatility, stability and efficiency of the Newton—Raphson technique, further extensions and formalisms are generated in the constrained family of algorithms. Specifically, this paper; (i) introduces the use of piecewise continuous constraint bounds and, (ii) extends the formal rigorous base of the constrained scheme by considering such items as convergence characteristics, the existence of safety zones and self-adaptive attributes. To benchmark the enhancements, the results of several numerical experiments involving large deformation elasticity problems are presented. These illustrate the inherent stability and efficiency of the constrained incremental scheme in handling problems with varying curvature definiteness.  相似文献   

Perceived Psychological Control in Early Adolescence Predicts Lower Levels of Adaptation into Mid-Adulthood     

Emily L. Loeb  Jessica Kansky  Joseph S. Tan  Meghan A. Costello  Joseph P. Allen 《Child development》2021,92(2):e158-e172

This study examined perceived parental psychological control in early adolescence as a critical stressor likely to be associated with lower levels of adaptation into mid-adulthood. A diverse sample of 184 adolescents was followed from age 13 through 32 to assess predictions to adult adaptation. Perceived parental psychological control at age 13 predicted relative decreases in observed support, lower likelihood of being in a romantic relationship, and lower academic attainment (after accounting for grade point average at baseline) by age 32. Many outcomes were mediated by lower levels of psychosocial maturity and peer acceptance in mid-adolescence. Overall, results suggest that perceived parental psychological control in early adolescence potentially undermines autonomy so as to lead to less favorable outcomes well into adulthood.  相似文献   

Technology integration for young children during COVID-19: Towards future online teaching     

Xinyun Hu  Ming Ming Chiu  Wai Man Vivienne Leung  Nicola Yelland 《British journal of educational technology : journal of the Council for Educational Technology》2021,52(4):1513-1537

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Assessing Preknowledge Cheating via Innovative Measures: A Multiple-Group Analysis of Jointly Modeling Item Responses,Response Times,and Visual Fixation Counts     

Kaiwen Man  Jeffrey R. Harring 《Educational and psychological measurement》2021,81(3):441

Many approaches have been proposed to jointly analyze item responses and response times to understand behavioral differences between normally and aberrantly behaved test-takers. Biometric information, such as data from eye trackers, can be used to better identify these deviant testing behaviors in addition to more conventional data types. Given this context, this study demonstrates the application of a new method for multiple-group analysis that concurrently models item responses, response times, and visual fixation counts collected from an eye-tracker. It is hypothesized that differences in behavioral patterns between normally behaved test-takers and those who have different levels of preknowledge about the test items will manifest in latent characteristics of the different data types. A Bayesian estimation scheme is used to fit the proposed model to experimental data and the results are discussed.  相似文献   

Higher education in Hong Kong — the approach to 1997 and the China factor     

Joseph Y. S. Cheng 《Higher Education》1995,30(3):257-271

Hong Kong has two major economic assets: its geographical location and labour force. Shortage of educated manpower has created a bottleneck hampering economic growth. Substantial emigration flows relating to 1997 is also a problem. Development of higher education and infrastructure are means to ensure sustainable economic growth. The government plans to enable 25% of the relevant age group to attend degree and diploma courses in 1995 through rapid expansion and heavy subsidy.Most families are willing to work hard to provide for their children's education. They believe that their society is full of opportunities, and wealth and education important criteria determining one's social status. While Confucian ethics continue to influence attitudes and values, utilitarian considerations are now significant in the choice of disciplines, extra-curricular activities, staff-student relationship, etc.Rapid expansion of tertiary education creates a shortage of qualified staff and students. Fear of 1997 affects academics' dedication. They have to plan their insurance policy and signs of self-censorship emerge. Meanwhile, localization makes progress and the government begins to support research. Exchanges with China allowed local academics to help Chinese universities to renew their external linkages and establish new curricula.Higher education in Hong Kong has completed its take-off. It has achieved standards of developed countries. In the 1990s, it will attempt to consolidate and improve its quality.This is the updated and revised version of a paper prepared for the conference Hong Kong In Transition 1992 organized by the One Country Two Systems Economic Research Institute in Hong Kong  相似文献   

The cargo cult and the protestant ethic as conflicting ideologies: Implications for education     

Joseph M. Conforti 《The Urban Review》1989,21(1):1-14

As a prolonged endeavor, education has been ideologically justified in American society by the certainty of the Protestant ethic, in terms of rewards for adherence and punishment for deviation. That certainty is increasingly challenged by contemporary culture's numerous celebrations of cataclysmic reward of inherent endowment, cunning, speculative choice, and fortuitous circumstances. In essence, a nascent cargo cult ideology posits as an alternative to the certainty of the Protestant ethic, the indetermination of good fortune. This paper seeks to distinguish the Protestant ethic and cargo oult as competing ideologies, how each articulates to the organization of formal education and its presumptions, and some implications of their contention for education.  相似文献   

A plan for the development of a conceptually-based mathematics curriculum for disadvantaged children I: Theoretical foundations     

Joseph M. Scandura 《Instructional Science》1972,1(2):247-262

The purpose of this two-part article is to point the way towards more sophisticated educational technologies with specific reference to educating the disadvantaged. In Part I, after summarizing some of the current problems in educating the disadvantaged, a new theory of structural learning is proposed and relationships between this theory, educational technology, and curriculum development are made explicit. This conceptual framework then is used as a basis for planning curriculum development in education. Part II shows in more detail how this plan may be applied in the real world with special reference to three specific projects:

1. An efficient and self-instructional way to diagnose and teach the basic arithmetical skills of addition, subtraction, multiplication, and division.
2. A systematic way of teaching children how to read critically based on a behavioral analysis of the process in terms of logical reasoning.
3. A plan for in-service teacher education which deals with mathematical processes (as opposed to content).

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Examining a Comprehensive College Transition Program: An Account of Iterative Mixed Methods Longitudinal Survey Design     

Cole  Darnell  Kitchen  Joseph A.  Kezar  Adrianna 《Research in higher education》2019,60(3):392-413

Research in Higher Education - There are few accounts in the higher education literature of mixing methods at the survey design stage and very little guidance targeting higher education researchers...  相似文献   

The Development of Diploma in Education Student Teachers’ Mathematics Pedagogical Content Knowledge     

Suat Khoh Lim-Teo  Kwee Gek Chua  Wai Kwong Cheang  Joseph K. Yeo 《International Journal of Science and Mathematics Education》2007,5(2):237-261

Mathematics pedagogical content knowledge (MPCK) of teachers cannot be easily defined but is a complex concept integrating generic pedagogical knowledge, mathematics teaching methodology as well as knowledge of the discipline of mathematics. It is the objective of mathematics methodology courses in teacher preparation programmes to begin the development of MPCK in their pre-service teachers. As part of a research study on the development of MPCK in primary school beginning teachers, a 16-item instrument was developed to measure some aspects of the MPCK for teaching mathematics at primary level. The instrument was administered to the 2003 Intake of the Diploma in Education student teachers at the National Institute of Education, Singapore just at the beginning of their programme. As they completed their methodology course in February 2005, the instrument was administered again. This paper will discuss the findings concerning their performance in these two tests, with reference to the overall performance as well as topic-specific and MPCK construct-specific performance. The findings indicate that student teachers at the beginning of their programmes are generally quite weak in their mathematics pedagogical content knowledge, as might be expected. There was significant improvement in some aspects of their MPCK on completion of their mathematics pedagogy course.  相似文献