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排序方式: 共有640条查询结果,搜索用时 15 毫秒
1.
This article proposes several estimators for estimating the ridge parameter k based on Poisson ridge regression (RR) model. These estimators have been evaluated by means of Monte Carlo simulations. As performance criteria, we have calculated the mean squared error (MSE), the mean value, and the standard deviation of k. The first criterion is commonly used, while the other two have never been used when analyzing Poisson RR. However, these performance criteria are very informative because, if several estimators have an equal estimated MSE, then those with low average value and standard deviation of k should be preferred. Based on the simulated results, we may recommend some biasing parameters that may be useful for the practitioners in the field of health, social, and physical sciences. 相似文献
2.
Laurent Gardes Stéphane Girard Gilles Stupfler 《Scandinavian Journal of Statistics》2020,47(3):922-949
The conditional tail expectation (CTE) is an indicator of tail behavior that takes into account both the frequency and magnitude of a tail event. However, the asymptotic normality of its empirical estimator requires that the underlying distribution possess a finite variance; this can be a strong restriction in actuarial and financial applications. A valuable alternative is the median shortfall (MS), although it only gives information about the frequency of a tail event. We construct a class of tail Lp-medians encompassing the MS and CTE. For p in (1,2), a tail Lp-median depends on both the frequency and magnitude of tail events, and its empirical estimator is, within the range of the data, asymptotically normal under a condition weaker than a finite variance. We extrapolate this estimator and another technique to extreme levels using the heavy-tailed framework. The estimators are showcased on a simulation study and on real fire insurance data. 相似文献
3.
Johann le Roux 《Intercultural Education》2002,13(1):37-48
Effective formal education or schooling is not simply a matter of teaching and learning curriculum content. It is also about values, assumptions, feelings, perceptions and relationships. No education can take place without interpersonal communication. Effective teaching can thus be qualified in terms of relating effectively in the classroom. Effective education thus also presupposes effective communication skills. Communication as the means and indeed the medium of education is therefore crucial to school success in culturally diverse education. Teachers should therefore be sensitive to the potentially problematic outcomes of intercultural communication in the culturally diverse class. Communication may be a useful source of intercultural knowledge and mutual enrichment between culturally diverse students if managed proactively by the teacher. Otherwise, it could be a source of frustration, misapprehensions, intercultural conflict and ultimately school failure. Effective and successful communication is difficult to realise even in the most favourable circumstances. Intercultural factors, therefore, create the potential for numerous communication problems and intercultural conflict. Communication, both verbal as well as non-verbal, is critically important in cross-cultural competence. As language and culture are inextricably bound, cross-cultural communication is complex and potentially problematic. In this paper, it is argued that effective educators are effective communicators and thus culturally competent in cross-cultural encounters. 相似文献
4.
We used two statistical methods to identify prognostic factors: a log-linear model (logistic and COX regression, based on the notions of linearity and multiplicative relative risk), and the CORICO method (ICOnography of CORrelations) based on the geometric significance of the correlation coefficient. We applied the methods to two different situations (a "case-control study' and a "historical cohort'). We show that the geometric exploratory tool is particularly suited to the analysis of small samples with a large number of variables. It could save time when setting up new study protocols. In this instance, the geometric approach highlighted, without preconceived ideas, the potential role of multihormonality in the course of pituitary adenoma and the unexpected influence of the date of tumour excision on the risk attached to haemorrhage. 相似文献
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论创新教育与大学生课外科技活动 总被引:3,自引:0,他引:3
介绍了大学开展创新教育的意义及对大学生的影响 ,论述了创新教育与大学生课外科技活动的关系 ,即创新教育是大学生课外科技活动出成果的前提 ,大学生课外科技活动是创新教育的新平台和主要形式 ,它既是创新教育的实践环节 ,检验着创新教育的成果 ,又丰富着创新教育的内涵 ,同时是提高大学生创新精神和能力的主要途径。提出了高校要多方面创造条件 ,深化大学生课外科技活动。 相似文献
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Rational decision making under complete ignorance, a limit case of uncertainty, is defined. Through a concept of approximation, a meaning is given to a criterion almost possessing a property. Rational criteria depend almost on the sole bounds of the outcome range of each decision, they are almost continuous, they can almost possess a transitive indifference relation; however, under Savage's Independence Axiom, this last property restricts possible criteria to those which can be approximated, at least partly, by either the Maximin or the Maximax criterion. 相似文献
9.
Kenneth Aarskaug Wiik Renske Keizer Trude Lappegård 《Journal of marriage and the family》2012,74(3):389-398
In this study, the authors used data from the first wave of the Generations and Gender Survey to investigate relationship quality among currently married and cohabiting individuals ages 18 to 55 (N = 41,760) in 8 European countries (Bulgaria, France, Germany, Hungary, Norway, Romania, Russia, and The Netherlands). They expected to find fewer differences between cohabitation and marriage in countries where cohabitation is widespread. Controlling for a range of selection characteristics of respondents and their partners (e.g., common children, union duration, and education), the analyses showed that in all countries cohabiters more often had breakup plans and were less satisfied with their relationships than individuals who married. This cohabitation gap in relationship quality was largest in Russia, Romania, and Germany, which indeed were among the countries in the current sample where cohabitation was least prevalent. 相似文献
10.
Heid Nøkleby Geir Pedersen Finn Skårderud 《Journal of social work practice in the addictions》2014,14(3):225-238
The aim of this study is to measure and describe symptoms of eating disorders among females in treatment for drug addiction in Norway. Previous clinical and epidemiological studies have revealed coprevalence between eating disorders and substance use or abuse. However, few studies have measured eating disorders in drug-using samples and even fewer within the context of drug treatment. In this study, 29 females with drug use disorder in residential treatment were tested with the Eating Disorder Inventory–2. A subgroup of 9 females (31%) with significant symptoms of eating disorders was identified. The characteristics of this group and possible clinical consequences are discussed. 相似文献