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961.
962.
Correspondence analysis and optimal structural representations 总被引:1,自引:0,他引:1
Many well-known measures for the comparison of distinct partitions of the same set ofn objects are based on the structure of class overlap presented in the form of a contingency table (e.g., Pearson's chi-square statistic, Rand's measure, or Goodman-Kruskal'sτ b ), but they all can be rephrased through the use of a simple cross-product index defined between the corresponding entries from twon ×n proximity matrices that provide particular a priori (numerical) codings of the within- and between-class relationships for each of the partitions. We consider the task of optimally constructing the proximity matrices characterizing the partitions (under suitable restriction) so as to maximize the cross-product measure, or equivalently, the Pearson correlation between their entries. The major result presented states that within the broad classes of matrices that are either symmetric, skew-symmetric, or completely arbitrary, optimal representations are already derivable from what is given by a simple one-dimensional correspondence analysis solution. Besides severely limiting the type of structures that might be of interest to consider for representing the proximity matrices, this result also implies that correspondence analysis beyond one dimension must always be justified from logical bases other than the optimization of a single correlational relationship between the matrices representing the two partitions. 相似文献
963.
Brian P. Conaghan M.Sc. Dip. Audiology Nirbhay N. Singh Ph.D. Theresa L. Moe B.S. Timothy J. Landrum Ph.D. Cynthia R. Ellis M.D. 《Journal of Behavioral Education》1992,2(2):177-205
Behavioral procedures have been used to teach manual communication skills to individuals with mental retardation, although few studies have examined the assessment of generalization of such skills beyond the teaching environment. In this study, we investigated the effectiveness of directed rehearsal for teaching and facilitating the generalization of manual signs by six hearing-impaired adults with mental retardation. The effects of directed rehearsal, alone and combined with positive reinforcement for correct responses, were compared to a no-training control condition in an alternating treatments design. Although directed rehearsal was superior to the no-training control condition in teaching manual signs, the procedure was more effective when combined with positive reinforcement. The combined procedure was used to facilitate the generalization of learned signs across a number of variables. The results showed that there were high levels of generalization by all participants across novel phrases, settings, and trainers but variable levels of generalization to another response mode by some subjects. Further, increased levels in overall vocal communication were found for most participants. 相似文献
964.
This paper presents an integrative model of treatment—family focused relational psychotherapy—and applies it to work with adult children of divorce (ACDs). Three areas of assessment are identified—(a) assessment of individual ego development, (b) assessment of family of origin functioning, and (c) assessment of the nature of the parents' divorce (e.g., level of conflict). Based on this assessment, the treatment model is presented, which integrates strategies from relational/psychodynamic therapy, family of origin work, and experiential techniques. Case examples are presented to demonstrate the appropriate integration of these techniques with clients at different levels in the assessment schema. In addition, a review of the literature on the long-term effects of divorce on children suggests several specific issues that may arise in treatment. These include low self-esteem, emotional distress, externalizing problems, and interpersonal problems such as fear of commitment, difficulty trusting, a high rate of divorce, and strained relationships with parents. 相似文献
965.
Henk A. L. Kiers 《Psychometrika》1997,62(2):251-266
A general approach for fitting a model to a data matrix by weighted least squares (WLS) is studied. This approach consists of iteratively performing (steps of) existing algorithms for ordinary least squares (OLS) fitting of the same model. The approach is based on minimizing a function that majorizes the WLS loss function. The generality of the approach implies that, for every model for which an OLS fitting algorithm is available, the present approach yields a WLS fitting algorithm. In the special case where the WLS weight matrix is binary, the approach reduces to missing data imputation.This research has been made possible by a fellowship from the Royal Netherlands Academy of Arts and Sciences to the author. 相似文献
966.
Probability matrix decomposition models 总被引:1,自引:0,他引:1
In this paper, we consider a class of models for two-way matrices with binary entries of 0 and 1. First, we considerBoolean matrix decomposition, conceptualize it as alatent response model (LRM) and, by making use of this conceptualization, generalize it to a larger class of matrix decomposition models. Second,probability matrix decomposition (PMD) models are introduced as a probabilistic version of this larger class of deterministic matrix decomposition models.
Third, an algorithm for the computation of the maximum likelihood (ML) and the maximum a posteriori (MAP) estimates of the
parameters of PMD models is presented. This algorithm is an EM-algorithm, and is a special case of a more general algorithm
that can be used for the whole class of LRMs. And fourth, as an example, a PMD model is applied to data on decision making
in psychiatric diagnosis.
This paper is based on a chapter of the first author's doctoral dissertation, written at the University of Leuven and supervised
by Paul De Boeck. 相似文献
967.
The hypothesis that the VPI and WVI are measuring the same domain based on theoretical similarities was tested using 195 male freshmen students. The data were analyzed by correlational technique including discriminant analysis. The results allow for the interpretation that the VPI and WVI are in fact measuring two distinctive domains. 相似文献
968.
A number of hypotheses about infants' delayed search accuracy have been based upon the notion that a location associated with repeated retrieval of the object attains privileged status. Infants may need strong cues to search at a new location. However, a test is reported in which performance of 12- and 15-month-old infants was shown to be indifferent to the location. The results were reliable at an individual level. The data accord with previous research upon the canonicality effect in infant spatial search, an effect which is taken to index an experiential constraint on spatial discrimination. The experimental design thus serves as a discriminative test between three approaches: the original privileged location hypothesis, a newer spatial-contrast hypothesis, and a wider approach which focuses on experiential constraints on learning, including the canonicality effect. 相似文献
969.
Rolf Langeheine 《Psychometrika》1982,47(4):427-442
PINDIS, as recently presented by Lingoes and Borg [1978] not only marks the latest development within the scope of individual differences scaling, but, may be of benefit in some closely related topics, such as target analysis. Decisions on whether the various models available from PINDIS fit fallible data are relatively arbitrary, however, since a statistical theory of the fit measures is lacking. Using Monte Carlo simulation, expected fit measures as well as some related statistics were therefore obtained by scaling sets of 4(4)24 random configurations of 5(5)30 objects in 2, 3, and 4 dimensions (individual differences case) and by fitting one random configuration to a fixed random target for 5(5)30 objects in 2, 3, and 4 dimensions (target analysis case). Applications are presented. 相似文献
970.
Arthur Peacocke 《Zygon》1999,34(4):695-712
The challenge and stimulus to theology that is constituted by the scientific version of Genesis which will prevail for the foreseeable future is expounded in relation to the significance of the succeeding stages of the life process and to the general features of biological evolution. A responsive theology of evolution is discerned as involving a renewal of insights associated with the themes of immanence, panentheism, the Wisdom and Word of God, and a sacramental universe. Such a revitalized theology allows one to conceive of humanity and Jesus the Christ in a fully evolutionary perspective without loss of an emphasis on the particularity of the Incarnation. 相似文献