A binomial test for hierarchical dependency

A binomial test for hierarchical dependency is presented. The null hypothesis is that all members of a population who possess a certain skill are a subset of the members who possess another skill. This hypothesis is basic to the writings of several prominent theorists, such as Gagné and Piaget. The model, assumptions, formula derivations, and procedures for the test are explained. An illustrative example is also provided.     

樟柳碱所致学习和记忆障碍动物模型的探讨

本实验采用水迷津法、步下法和步入法,用樟柳碱制备学习和记忆障碍的动物模型。结果表明,樟柳碱(10毫克/公斤)可使小鼠引起学习障碍,其表现为通过水迷津全程的时间延长,而且小鼠进入盲路的错误次数明显增多。樟柳碱(10毫克/公斤)可使小鼠引起记忆障碍,在樟柳碱的影响下,小鼠步下平台或步入暗箱的潜伏期明显缩短,并使它们的错误次数增多。本实验结果进一步表明,测定小鼠的记忆障碍,步入法似乎比步下法更为敏感。     

Development of the Treatment Acceptability Questionnaire

This article describes the development and psychometric properties of a measure designed to assess the treatment acceptability of psychological treatments for both adult and child populations. Initial evidence on the Treatment Acceptability Questionnaire (TAQ) indicates that it has a good internal consistency and test-retest stability (over a 3-week period). The pattern of correlations with other measures of treatment acceptability for child-oriented interventions provides evidence of concurrent validity. Suggestions are made regarding the further validation and use of the TAQ.     

具体认知和抽象认知与社会文化因素的关系

采用认知测试、查阅人类学资料、现场调查和谈话等多种方法,探讨了我国不同生产方式、不同地区和不同民族４６０名成人的具体认知、抽象认知和认知方式及其与生态文化因素的关系。研究结果基本支持了我们理论上所假设的社会文化因素与具体认知操作、抽象认知操作、认知方式的关系,即狩猎和城市社会的生态环境和生产方式对人施加一种生态压力,增进其个体的具体的和抽象的认知,促使其抽象型认知方式的形成;而在捕鱼、游牧和农耕社会的生态环境和生产方式的作用下,个体倾向于较低水平的具体和抽象认知操作以及具体型的认知方式。紧密的社会结构和强调服从的社会化过程,与其个体较低水平的具体和抽象认知及具体型的认知方式相关联;而松散的社会结构和强调自主性的社会化过程,与较高水平具体和抽象认知操作、抽象型的认知方式相联系。正规教育等现代化因素是促进人认知,特别是抽象认知的有力因素。     

团体儿童智力测验（GITC）全国城市常模的制订

论文阐述了制订团体儿童智力测验（ＴｈｅＧｒｏｕｐＩｎｔｅｌｌｉｇｅｎｃｅＴｅｓｔｆｏｒＣｈｉｌｄｒｅｎ,简称ＧＩＴＣ）全国城市常模的过程。分布在全国各地的协作组成员对随机抽取的年龄在９岁至１８岁范围内的３９１６名中小学生施行了本测验。论文对施测结果进行了分析并报告了有关全国常模的基本信息。     

Polytomous IRT models and monotone likelihood ratio of the total score

In a broad class of item response theory (IRT) models for dichotomous items the unweighted total score has monotone likelihood ratio (MLR) in the latent trait. In this study, it is shown that for polytomous items MLR holds for the partial credit model and a trivial generalization of this model. MLR does not necessarily hold if the slopes of the item step response functions vary over items, item steps, or both. MLR holds neither for Samejima's graded response model, nor for nonparametric versions of these three polytomous models. These results are surprising in the context of Grayson's and Huynh's results on MLR for nonparametric dichotomous IRT models, and suggest that establishing stochastic ordering properties for nonparametric polytomous IRT models will be much harder.Hemker's research was supported by the Netherlands Research Council, Grant 575-67-034. Junker's research was supported in part by the National Institutes of Health, Grant CA54852, and by the National Science Foundation, Grant DMS-94.04438.     

On the robustness of maximum likelihood scaling for violations of the error model

A Monte Carlo study was conducted to investigate the robustness of the assumed error distribution in maximum likelihood estimation models for multidimensional scaling. Data sets generated according to the lognormal, the normal, and the rectangular distribution were analysed with the log-normal error model in Ramsay's MULTISCALE program package. The results show that violations of the assumed error distribution have virtually no effect on the estimated distance parameters. In a comparison among several dimensionality tests, the corrected version of thex ² test, as proposed by Ramsay, yielded the best results, and turned out to be quite robust against violations of the error model.     

The relationship between Fisher's exact test and Pearson's chi-square test: A bayesian perspective

It is demonstrated in this paper that two major tests for 2 × 2 talbes are highly related from a Bayesian perspective. Although it is well-known that Fisher's exact and Pearson's chi-square tests are asymptotically equivalent, the present analysis shows that a formal similarity also exists in small samples. The key assumption that leads to the resemblance is the presence of a continuous parameter measuring association. In particular, it is shown that Pearson's probability can be obtained by integrating a two-moment approximation to the posterior distribution of the log-odds ratio. Furthermore, Pearson's chi-square test gave an excellent approximation to the actual Bayes probability in all 2×2 tables examined, except for those with extremely disproportionate marginal frequencies.     

应激对大鼠行为和部分脑区谷氨酸含量的影响

以旷场试验法测定动物在急、慢性躯体性和心理性应激时的行为变化,以快速断头冷冻匀浆法,用ＨＩＴＡＣＨＩ－８３５氨基酸分析仪测定应激各期视皮层、海马、下丘脑、小脑谷氨酸含量。并对正常动物经侧脑室微量注射Ｌ－ＡＰ４后观察行为变化。结果显示,急性应激期动物行为活动增加,慢性应激期减少：应激时,大鼠部分脑区的谷氨酸含量与对照组相比在不同时期呈显著性差异;侧脑室微量注射Ｌ－ＡＰ４提示行为活动减弱可能与脑内Ｇｌｕ系统的活动有关。