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21.
Ke‐Hai Yuan Peter M. Bentler 《The British journal of mathematical and statistical psychology》2010,63(2):273-291
Many test statistics are asymptotically equivalent to quadratic forms of normal variables, which are further equivalent to with zi being independent and following N(0,1). Two approximations to the distribution of T have been implemented in popular software and are widely used in evaluating various models. It is important to know how accurate these approximations are when compared to each other and to the exact distribution of T. The paper systematically studies the quality of the two approximations and examines the effect of the λi and the degrees of freedom d by analysis and Monte Carlo. The results imply that the adjusted distribution for T can be as good as knowing its exact distribution. When the coefficient of variation of the λi is small, the rescaled statistic is also adequate for practical model inference. But comparing TR against will inflate type I errors when substantial differences exist among the λi, especially, when d is also large. 相似文献
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视觉环境中不变的空间布局信息能够引导观察者将注意快速指向特定的位置并促进对该位置上目标物体的识别,这种现象称为空间情境提示效应.在系统回顾以往研究的基础上,对空间情境提示效应的经典研究和实验范式,空间情境学习的性质、内容与过程,以及空间情境提示效应的产生机制和神经基础进行分析梳理.文章在最后总结了以往研究中存在的5个争议性的问题,并指出未来研究可以操纵研究材料和任务难度等关键变量来解决这些问题. 相似文献
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通过一个2(成功与否)×2(提示与否)×2(题型)的混合实验设计,对小学五年级学生解决和差应用题的表征策略进行了研究.结果表明:(1)与比较应用题的表征相类似,小学生对和差应用题的表征也存在着直译策略和问题模型策略;(2)不成功组解题者在表征和差应用题时倾向于运用直译策略,而成功组的解题者更倾向于运用问题模型策略,这导致了成功者与不成功者在列式上的差异,特别是在不一致题型上表现得更明显;(3)在读题前给以“请注意理解这道题的意思”这样简单的提示,对不成功的解题者对和差问题的正确表征并不能起到作用;(4)成功的和差应用题解题者和不成功的解题者在列式正确性的自我评价上存在显著差异. 相似文献
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异体造血干细胞移植(Allo-HSCT)已成为治疗恶性血液病及其他各种疾病的有效方法之一。在Allo-HSCT中由于供体和受体免疫屏障的存在。从而一开始就是一个供受体矛盾的对立统一的过程。对其中矛盾的研究和解决充满了辩证唯物的哲学思想。也促使Allo-HSCT技术不断发展。新的方法和理念不断出现。使Allo-HSCT治疗白血病的疗效不断提高。 相似文献
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REN FLINCH MIDTGAARD 《Journal of applied philosophy》2007,24(3):299-315
abstract The paper considers what (if anything) can justify that a utopian community or a micro‐society makes an exception to the general rules of society for itself. The discussion evolves around the Danish case of Christiania. Three moral theories, to wit Kantian constructivism, rule‐consequentialism and act‐consequentialism, are applied to the case at hand. The aim is to test whether the exceptions in question are unjust or in other ways morally problematic. The two former theories appear to deny the justice of Christiania. The relevant exceptions are unacceptable according to those two moral perspectives. Act‐consequentialism, however, seems to endorse the case of Christiania, including the exceptions pertaining to it. While the latter theory is often thought to conflict with widely shared reflective moral convictions, in this case it might square with at least an important pragmatic layer of Danish public culture. 相似文献
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The structure of online political discussion has proven important to deliberative democracy. However, the organizational mechanisms of the structure receive little attention in scholarship. This study employed a random‐effects relational event model to differentiate and examine the effects of a set of organizational principles in web forum discussions. By analyzing more than 175,000 forum replies, the study found that cross‐ideological debate is an independent organizational mechanism even when accounting for the effects from common interests, opinion congruity, purely structural effects, and conversational norms. These findings differ from the selective exposure thesis and previous incidental claims of political disagreement. In addition, the findings indicate that endogenous mechanisms and opinion congruity could influence the tendency of cross‐ideological debate to varying degrees. 相似文献
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REN OVERGAARD 《Pacific Philosophical Quarterly》2010,91(2):260-284
In recent publications, Michael Tye and Alva Noë have claimed that there is a sense in which a tilted plate looks round and another sense in which it looks elliptical. This paper argues that their proposal faces decisive objections. On Tye and Noë's account of ordinary, veridical perception, appearances are in constant conflict. As a characterization of ordinary visual experience, this cannot be correct. I examine various responses to this criticism, and conclude that they all fail. I then argue that Noë's account has the further, unintended and undesirable consequence of promoting a version of the sense‐datum theory. 相似文献
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Hai V. Nguyen 《Journal of Happiness Studies》2016,17(3):1255-1271
Although individuals are known to be affected by concerns about relative position, little research investigates how neighbors’ wealth affects one’s hypertension risks. This paper investigates the relationship between neighborhood wealth and hypertension using both self-reported hypertension and objective hypertension. I find that self-reported hypertension rate substantially underestimates objectively measured hypertension rate. Consequently, while there is a positive, statistically significant relationship between neighborhood wealth and hypertension when using self-reported hypertension, the results based on measured hypertension data differ substantially, with the relationship only observed for people aged 55–65 but not for younger or older age groups. There is also evidence of a positive relationship between continuous blood pressure and neighborhood wealth for adult people (aged 30 or older). 相似文献
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