The statistical analysis of general processing tree models with the EM algorithm

Multinomial processing tree models assume that an observed behavior category can arise from one or more processing sequences represented as branches in a tree. These models form a subclass of parametric, multinomial models, and they provide a substantively motivated alternative to loglinear models. We consider the usual case where branch probabilities are products of nonnegative integer powers in the parameters, 0_s1, and their complements, 1 - _s. A version of the EM algorithm is constructed that has very strong properties. First, the E-step and the M-step are both analytic and computationally easy; therefore, a fast PC program can be constructed for obtaining MLEs for large numbers of parameters. Second, a closed form expression for the observed Fisher information matrix is obtained for the entire class. Third, it is proved that the algorithm necessarily converges to a local maximum, and this is a stronger result than for the exponential family as a whole. Fourth, we show how the algorithm can handle quite general hypothesis tests concerning restrictions on the model parameters. Fifth, we extend the algorithm to handle the Read and Cressie power divergence family of goodness-of-fit statistics. The paper includes an example to illustrate some of these results.This research was supported by National Science Foundation Grant BNS-8910552 to William H. Batchelder and David M. Riefer. We are grateful to David Riefer for his useful comments, and to the Institute for Mathematical Behavior Sciences for its support.     

高中生心理健康水平及其影响因素的研究

采用ＳＣＬ－９０量表评定了５００名高中生的心理健康状况,运用因素分析的方法探讨了影响高中生心理健康的主要因素。结果表明：有１０．８％的高中生存在着各种明显的心理健康问题;高中生的心理健康问题主要表现为强迫、敌对、偏执、人际关系敏感和忧郁等症状;影响高中生心理健康的主要因素为学校教育、家庭环境、社会文化及学生自身等方面的生活事件;高中生不同的心理健康问题有其不同的影响因素。     

Global and Regional Perspectives on Testing Children and Youth: An Empirical Study

The results of an international survey of test use in 44 countries are reported. Data are presented and discussed for six groupings: highly industrialised, less industrialised Western, developing Third World, socialist, Middle East, and least developed nations. A total of 740 tests were identified. A number of similarities exist among the six groupings in their test use. Intelligence tests are most commonly used followed by personality and achievement tests. Important differences also exist. For example, the developing Third World and Middle East nations use more group than individually administered tests and fewer achievement tests. Many tests lack reliability and validity studies and norms. Additional tests are needed to assess achievement, intelligence, social development, personality, and vocational interests and aptitudes. Tests are especially needed for children and youth who are learning disabled, mentally retarded, and slow learners. Problems created by these conditions and implications of the frequent use of foreign developed tests are discussed.     

小剂量吗啡对大鼠活动性的影响

腹腔注射不同剂量吗啡,观察各组大鼠在给药后不同时间的活动性（ｌｏｃｏｍｏｔｏｒａｃｔｉｖｉｔｙ,ＬＡ）,连续给药８天,每天给药后９５ｍｉｎ内,每间隔１５ｍｉｎ,记录大鼠５ｍｉｎ内在限定空间中所走格数。结果表明：随吗啡给药剂量或次数增加,ＬＡ呈升高趋势;使大鼠ＬＡ明显兴夯的适宜低剂量为４ｍｇ／ｋｇ／ｄａｙ,该剂量下每天药后１５－２０ｍｉｎＬＡ为峰值,而且此时段ＬＡ逐日升高,至第８日出现下降趋势,此毕     

Investigating behavior inhibition in obsessive-compulsive disorder: Evidence from eye movements

We investigated the role of inhibition failure in Obsessive Compulsive Disorder (OCD) through an eye tracking experiment. Twenty-five subjects with OCD were recruited, as well as 25 with Generalized Anxiety Disorder (GAD) and 25 healthy controls. A 3 (group: OCD group, GAD group and control group) × 2 (target eccentricity: far and near) × 2 (saccade task: prosaccade and antisaccade) mixed design was used, with all participants completing two sets of tasks involving both prosaccade (eye movement towards a target) and antisaccade (eye movement away from a target). The main outcome was the eye movement index, including the saccade latency (the time interval from the onset of the target screen to the first saccade) and the error rate of saccade direction. The antisaccade latency and antisaccade error rates for OCDs were much higher than those for GADs and healthy controls. OCDs had longer latency and error rates for antisaccades than for prosaccades, and for far-eccentricity rather than near-eccentricity stimuli. These results suggest that OCDs experience difficulty with behavior inhibition, and that they have higher visual sensitivity to peripheral stimuli. In particular, they show greatest difficulty in inhibiting behavior directed towards peripheral stimuli.     

法显西行起始及归国时间考--兼论“南国律学道士”

佛教东传后,我国西行求法的高僧代不乏人,其中东晋时期的法显法师“创辟荒途”[1],乃是我国历史上第一批到达印度的僧人,而且是第一位从陆路去、海路回的僧人。本文就法显西行求法的起始时间、归国时间及与之相关的“南国律学道士”等问题作一考察。     

学习策略在思维风格与数学学业成就关系中的中介效应研究

以227名大学二年级理科生为被试,采用问卷调查法,探讨了学习策略在思维风格与数学学业成就关系中的作用。结果表明：（1）认知策略、元认知策略在等级制风格与数学学业成就关系中起完全中介的作用,而资源管理策略在等级制风格与数学学业成就间的中介效应不显著。（2）认知策略、元认知策略在整体性风格与数学学业成就关系中起部分中介的作用,而资源管理策略在整体性风格与数学学业成就间的中介效应不显著。（3）认知策略、元认知策略和资源管理策略在开放性风格与数学学业成就关系中起部分中介的作用。（4）元认知策略在等级制风格与数学学业成就间的中介作用以及在开放性风格与数学学业成就间的中介作用都是相对较大的。     

象征之镜的生产和生产之镜的象征,或马克思和鲍德里亚

鲍德里亚批评马克思的逻辑有一个递进过程,从最初借助于马克思的拜物教理论发展出一种以符号(或形式)分析为核心的消费社会观,到对马克思主义“生产力”理论批评,最后以“象征交换”理论替代马克思的“生产”理论。在这一过程中,他把西方马克思主义哲学逻辑的失败原因追溯到马克思主义起点上,并借助于结构主义、精神分析和相关人类学成果构建了一种从象征关系入手对当代资本主义文化和意识形态的批判话语,但是在根本上“象征之镜”却是资本主义“生产之镜”话语之外的另一种非历史话语,批判本身成为与历史生成具体情境无关的一种话语反对另一种话语的斗争。在直接的意义上,鲍德里亚式的批评是当代左派激进文化批判的困境表现。     

白马藏族初中学生文化适应和智力水平的关系

从实证的角度探讨了白马藏族初中生的文化适应程度与其智力水平之间的关系,结果表明：自编的文化适应问卷包括的三个维度（主流文化认同、学校教育认同、对教学语言的熟悉和理解程度）与智力、学业成绩均存在显著的相关;在剔除学业成绩对智力的影响后,文化适应对白马藏族初中生的智力水平有显著的预测力。这一结果有助于人们对智力本质的理解,也为发展民族教育、促进民族现代化进程提供了理论依据。