材料的几何属性差异对3—7岁儿童分类标准影响的研究

以７３名３—７岁儿童为被试,通过变换分类材料的几何属性（形状或大小）的差异程度,采用自由分类方法,探讨材料差异程度的变换对儿童分类标准的影响。结果表明：３—７岁儿童的分类标准均受分类材料几何属性差异变化的影响。３岁儿童的分类标准几乎完全随分类材料的变换而改变;４—５岁儿童的分类标准主要表现为随分类材料的变换而改变;６—７岁儿童的分类标准虽然有随分类材料的变换而改变的趋势,但已经表现出比较稳定的按形状分类;５—６岁是儿童分类能力发展的质的飞跃阶段。     

An examination of procedures for determining the number of clusters in a data set

A Monte Carlo evaluation of 30 procedures for determining the number of clusters was conducted on artificial data sets which contained either 2, 3, 4, or 5 distinct nonoverlapping clusters. To provide a variety of clustering solutions, the data sets were analyzed by four hierarchical clustering methods. External criterion measures indicated excellent recovery of the true cluster structure by the methods at the correct hierarchy level. Thus, the clustering present in the data was quite strong. The simulation results for the stopping rules revealed a wide range in their ability to determine the correct number of clusters in the data. Several procedures worked fairly well, whereas others performed rather poorly. Thus, the latter group of rules would appear to have little validity, particularly for data sets containing distinct clusters. Applied researchers are urged to select one or more of the better criteria. However, users are cautioned that the performance of some of the criteria may be data dependent.The authors would like to express their appreciation to a number of individuals who provided assistance during the conduct of this research. Those who deserve recognition include Roger Blashfield, John Crawford, John Gower, James Lingoes, Wansoo Rhee, F. James Rohlf, Warren Sarle, and Tom Soon.     

A FUNCTIONAL ANALYSIS OF PHOTO-OBJECT MATCHING SKILLS OF SEVERELY RETARDED ADOLESCENTS

Matching-to-sample procedures were used to assess picture representation skills of severely retarded, nonverbal adolescents. Identity matching within the classes of objects and life-size, full-color photos of the objects was first used to assess visual discrimination, a necessary condition for picture representation. Picture representation was then assessed through photo-object matching tasks. Five students demonstrated visual discrimination (identity matching) within the two classes of photos and the objects. Only one student demonstrated photo-object matching. The results of the four students who failed to demonstrate photo-object matching suggested that physical properties of photos (flat, rectangular) and depth dimensions of objects may exert more control over matching than the similarities of the objects and images within the photos. An analysis of figure-ground variables was conducted to provide an empirical basis for program development in the use of pictures. In one series of tests, rectangular shape and background were removed by cutting out the figures in the photos. The edge shape of the photo and the edge shape of the image were then identical. The results suggest that photo-object matching may be facilitated by using cut-out figures rather than the complete rectangular photo.     

A monte carlo study of thirty internal criterion measures for cluster analysis

A Monte Carlo evaluation of thirty internal criterion measures for cluster analysis was conducted. Artificial data sets were constructed with clusters which exhibited the properties of internal cohesion and external isolation. The data sets were analyzed by four hierarchical clustering methods. The resulting values of the internal criteria were compared with two external criterion indices which determined the degree of recovery of correct cluster structure by the algorithms. The results indicated that a subset of internal criterion measures could be identified which appear to be valid indices of correct cluster recovery. Indices from this subset could form the basis of a permutation test for the existence of cluster structure or a clustering algorithm.     

聋童与听力正常儿童分类能力的比较研究

本研究通过不同性质的分类实验,比较了聋童和听力正常儿童在年龄和教育程度相同或相近的前提下表现出的分类能力的差异,研究结果表明:(1)听力正常儿童的分类水平高于聋童。(2)教育程度的提高对二者的分类水平均有明显的促进作用。(3)就本实验结果看,约在13、14岁间,二者的分类水平均趋于平稳。(4)具体语词的掌握对二者的分类水平均有明显的促进作用。(5)二者对具体材料的分类均优于对抽象材料的分类。     

Constrained latent class analysis: Simultaneous classification and scaling of discrete choice data

A reparameterization of a latent class model is presented to simultaneously classify and scale nominal and ordered categorical choice data. Latent class-specific probabilities are constrained to be equal to the preference probabilities from a probabilistic ideal-point or vector model that yields a graphical, multidimensional representation of the classification results. In addition, background variables can be incorporated as an aid to interpreting the latent class-specific response probabilities. The analyses of synthetic and real data sets illustrate the proposed method.The authors thank Yosiho Takane, the editor and referees for their valuable suggestions. Authors are listed in reverse alphabetical order.     

A nonrandomized minimax solution for passing scores in the binomial error model

A nonrandomized minimax solution is presented for passing scores in the binomial error model. The computation does not require prior knowledge regarding an individual examinee or group test data for a population of examinees. The optimum passing score minimizes the maximum risk which would be incurred by misclassifications. A closed-form solution is provided for the case of constant losses, and tables are presented for a variety of situations including linear and quadratic losses. A scheme which allows for correction for guessing is also described.This work was performed pursuant to Grant No. NIE-G-78-0087 with the National Institute of Education, Department of Health, Education, and Welfare, Huynh Huynh, Principal Investigator. Points of view or opinions stated do not necessarily reflect NIE position or policy and no official endorsement should be inferred. The editorial assistance and comments of Anthony J. Nitko and of Joseph C. Saunders are gratefully acknowledged.     

Flexible Computerized Adaptive Tests to Detect Misconceptions and Estimate Ability Simultaneously

The Scaling Individuals and Classifying Misconceptions (SICM) model is an advanced psychometric model that can provide feedback to examinees’ misconceptions and a general ability simultaneously. These two types of feedback are represented by a discrete and a continuous latent variable, respectively, in the SICM model. The complex structure of the SICM model brings difficulties in estimating both misconception profile and ability efficiently in a linear test. To overcome this challenge, this study proposes a flexible computerized adaptive test (FCAT) design as a new test delivery method to increase test efficiency by administering an individualized test to examinees. We propose three item selection methods and two transition criteria to determine adaptive steps based on the needs of estimating one or two latent variables. Through two simulation studies, we demonstrate how to select an appropriate item selection method for an adaptive step and what transition criterion should be used between two adaptive steps. Results reveal the combination of the item selection method and the transition criterion could improve the estimation accuracy of a specific latent variable to a different extent and thus provide further guidance in designing an FCAT.     

The Impact of Criminal Record Stigma on Quality of Life: A Test of Theoretical Pathways

Across multiple stigmatized groups, research suggests that stigma may negatively impact individual wellbeing. This impact often occurs through a sequential pathway that includes perceiving societal stigma, a diminished and stereotyped self‐concept (i.e., internalized stigma), experiences of discrimination and rejection, and attempts to cope with stigma (e.g., secrecy or withdrawal). While prior research supports individual links within this pathway, no study has evaluated a model representing the relationships between all of these factors in relation to criminal record stigma. This study utilized cross‐sectional data from an online survey of 198 adults to test the pathways through which criminal record‐related stigma impacts individual quality of life. The results indicated that perceived stigma was a significant predictor of discrimination and rejection experiences, secrecy coping strategies, and decreased quality of life. There was also a significant indirect association between perceived stigma and quality of life through secrecy coping. Consistent with recent criminal record stigma research, internalized stigma was low among respondents. These findings point to the importance of reducing criminal record stigma and discrimination, so that individuals with criminal records have more opportunities to enhance their quality of life without having to withdraw from society or keep their record a secret.