A clusterwise simultaneous component method for capturing within‐cluster differences in component variances and correlations

This paper presents a clusterwise simultaneous component analysis for tracing structural differences and similarities between data of different groups of subjects. This model partitions the groups into a number of clusters according to the covariance structure of the data of each group and performs a simultaneous component analysis with invariant pattern restrictions (SCA‐P) for each cluster. These restrictions imply that the model allows for between‐group differences in the variances and the correlations of the cluster‐specific components. As such, clusterwise SCA‐P is more flexible than the earlier proposed clusterwise SCA‐ECP model, which imposed equal average cross‐products constraints on the component scores of the groups that belong to the same cluster. Using clusterwise SCA‐P, a finer‐grained, yet parsimonious picture of the group differences and similarities can be obtained. An algorithm for fitting clusterwise SCA‐P solutions is presented and its performance is evaluated by means of a simulation study. The value of the model for empirical research is illustrated with data from psychiatric diagnosis research.     

Evaluating options by combined qualitative and quantitative methods

This paper addresses two problems related to qualitative decision making: option ranking and non-sensitivity to small differences between options. In general, only a partial order of options can be established by a qualitative model, which might be insufficient particularly when the number of options is large. A qualitative model is also incapable of discriminating between slightly different options. In this paper, a solution is proposed that is based on an automatic construction of a quantitative evaluation model from the qualitative one. In addition to a qualitative class, a quantitative utility is obtained for each option, which is used to rank options within classes and to reflect the sensitivity to small differences between options.     

The Recovery Model: Discourse Ethics and the Retrieval of the Self

The recovery model, as applied in mental health, is significant because it intends to foster a critical retrieval by the subject of herself as a self-determining agent of change. This paper will show that the recovery model represents an approach to caring for the self that is congruent with critical themes inherent in some forms of contemporary philosophy, particularly that of Michel Foucault and Jurgen Habermas. The paper will also consider the contribution that Habermas' discourse ethics could make towards the non-coercive, dialogical resolution of differences between clients and professionals.     

The Importance of the Task in Analyzing Expert Judgment

The accuracy of judgmental forecasts of temperature and precipitation was analyzed. In contrast to the findings of many studies of expert judgment and forecasting, forecasts were highly accurate and forecaster agreement was high. Human forecasters performed better than an operational forecasting model and about the same as a linear regression model. Differences between temperature and precipitation forecasts could be predicted from differences between the tasks. In general, differences between tasks were much greater than differences between forecasters. Task predictability was an excellent indicator of forecast accuracy. The characteristics of the environment for forecasting temperature and precipitation that contribute to accuracy include high-quality information and the availability of "guidance" based on a computer model. It is concluded that an understanding of the properties of the task is essential for understanding the accuracy of expert judgment.     

The Effect of Counselors on the Reward System of Teachers

This article discusses the hidden, often manifest, animosity between counselors and teachers. A model and an empirical study by a sociologist are utilized in examining the need-reward system of teachers and counselors. It is suggested that in their work with students both teachers and counselors receive maximum gratification through similar processes, but in different contexts. Conflict between teachers and counselors is primarily due to the lack of recognition by either party of the differences in criteria of success in learning and work satisfaction. It is hypothesized that at the elementary school level these differences will be most pronounced but have the greatest opportunity for resolution.     

The Social Capital of Blacks and Whites: Differing Effects of the Mass Media in the United States

This study relied on telephone survey interviews of adults in two U.S. metropolitan areas to examine whether the relationship between mass media use and social capital varies according to ethnicity. A multigroup approach taken with structural equation modeling validates a four‐factor model of social capital for Blacks and Whites and then, with the implementation of a comprehensive model that also includes mass media inputs, tests for structural variance between the ethnic groups. A well‐fitting comprehensive model is achieved, with significant differences between Blacks and Whites in terms of the mass media use structures. In support of the two hypotheses, the relationship between news use and social capital is less positive for Blacks than for Whites and the relationship between entertainment TV viewing and social capital is more negative for Blacks than for Whites. These findings are discussed in terms of literature involving mass media effects on social capital, news coverage of ethnic groups, and ethnic differences in self‐conceptualization and media responses.     

Using a general model of personality to understand sex differences in the personality disorders

In the present study, a general model of personality was used to evaluate sex bias in the personality disorders (PD). This present study compared observed sex differences among the personality disorders (PD) with differences expected based on the Five Factor Model of personality functioning (FFM). Observed sex differences were obtained by metaanalyzing over 30 reports. Expected sex differences were computed using what is known about sex differences in the FFM traits and how these traits relate to the PDs. Agreement between observed and expected sex differences was quite good for eight of ten PDs. For histrionic PD, the obtained sex difference was larger than expected; for schizotypal personality disorder, an expected sex difference was not obtained. Implications of understanding sex differences in terms of the FFM are discussed and suggestions for future research are provided.     

Examining the Invariance of Holland's Vocational Interest Model across Gender

This study examines the structural invariance of Holland's (1973, 1985) vocational interest model across gender. Evidence of gender differences in the fit of Holland's model was sought by submitting 14 (7 male; 7 female) previously published Strong Interest Inventory (SII) General Occupational Themes (GOT) scale correlation matrices to multiple structural analytic techniques. Randomization tests of hypothesized order relations (Hubert Arabie, 1987) and single sample confirmatory factor analyses (CFA) indicated a moderate to strong correspondence between GOT data and Holland's circular order and circumplex models. Randomization tests of differences in model–data fit, and two-sample CFA indicated that these models are a no more or less accurate representation of the observed data for men than for women. Additional analyses aimed at identifying gender differences in the misfit of specific aspects of Holland's model also yielded no evidence of differential fit.     

Parents of the Handicapped Child: Facilitating Acceptance Through Group Counseling

All parents have an image of the way they would like their children to be. Often this expectation is contradicted by reality for the parents of a handicapped child. Whether at the time of birth when obvious differences are apparent or later when performance differences are recognized, the discrepancy between expectation and reality causes parents to experience a loss and accompanying feelings of grief. This article suggests that the method of group counseling using a relevant framework on which to base discussion is without equal as a means of assisting parents to deal with their situations. Presented to those who lead parent groups for these persons is an applicable model and guidelines for its implementation.     

A Study of the Impact of Factor Importance Weightings on Job Satisfaction Measures

This study empirically tests Locke's theory that the importance of a job satisfaction factor to an individual is already reflected in the individual's responses to the specific questions, Responses from a job satisfaction survey carried out by a large Canadian company were analyzed using a second generation causal modeling technique, Partial Least Squares. The results supported Locke's theory in that weighting the responses with the individual's importance factors did not improve the variance explained in the job satisfaction model. Further analysis indicated that there were differences between groups with high job satisfaction and groups with low satisfaction, differences in job satisfaction for different levels of service length, and that the differences in job satisfaction across gender were not large.     

Age and individual differences in visuospatial processing speed: Testing the magnification hypothesis

Forty young adults and 40 older adults performed seven visuospatial information processing tasks. Factor analyses of the response times (RTs) yielded a single principal component with a similar composition in both age samples. For both samples, regressing the mean RTs of fast and slow subgroups for the seven tasks (18 conditions) on the corresponding mean RTs for their age group accounted for 99% of the variance. Taken together, these findings suggest that individual differences in processing time were largely task independent. The magnification hypothesis, a simple mathematical model of the interaction between age and ability, is presented. This model correctly predicts the finding that in both the young and the older adult groups, individual differences increased systematically with task difficulty. The magnification hypothesis also explains the regression parameters describing individual differences among young adults and predicts correctly that equivalent parameters describe individual differences among older adults. According to the magnification hypothesis, the RTs of slower individuals are more affected by aging than those of faster individuals, and slower individuals may be more at risk with respect to other biological insults (e.g., changes in health status) as well.     

Using the Rasch model to quantify the causal effect of test instructions

This experimental study was designed to quantify, by means of the Rasch model (RM), the effects of three instruction/scoring conditions on student measures and on the reliability of an achievement multiple-choice test in a field context. Examinees performed the test in one of three conditions which differed only in the instructions provided. Predictions regarding performance indicators were fulfilled, and the expected differences in reliability favoring omission-inducing instructions did appear. This difference in reliability was found for both Rasch and raw data and thus it can be concluded that the fact that results from previous studies failed to corroborate this prediction must have been due to the lack of important consequences of test scores for the students. The RM has served to neatly quantify the differences between instructions promoting guessing and instructions promoting omission under uncertainty, showing that the recommendation to omit is not only educationally but also psychometrically sound.     

A Note on Accepting the Null Hypothesis

Models are sometimes developed on the premise that there are no differences between two or more conditions regardless of experimental manipulation. This article argues that unless a very sensitive experiment (or series of experiments) was conducted, such conclusions are often premature. Design and statistical factors such as alpha level, variability, sample size, and treatment effect are all determinants of the sensitivity of the experiment. It is sometimes the case that an experiment produces differences between means and yet the null hypothesis is not rejected because of high variability within experimental conditions or because too few subjects were used. Unless the probability of detecting a difference between groups is known, it would seem unwise to conclude that no difference exists. Judgment on the model should be suspended. Examples are taken from the mass-spring and pulse-step models for voluntary movement control to illustrate the problem.     

Direct evidence for the existence of energy-based texture mechanisms

Two classes of models have been proposed to explain how the visual system processes texture modulations. In 'feature models', abstract representations of the featural properties of local texture regions (eg orientation, spatial frequency, contrast) are first generated, after which differences in individual feature properties across space are detected. In 'energy models', on the other hand, differences across space in the response energies of linear simple-cell-like filters are detected. This model thus processes the existing differences between texture regions directly without generating a full representation of the individual texture regions. We provide here direct evidence for the existence of the second, energy model, using an adaptation paradigm in conjunction with textures simultaneously modulated in two dimensions--orientation and spatial frequency. We found that the mechanism that processed the conjoint modulation was tuned to orientations and spatial frequencies that could not be predicted by any feature model, but which were precisely predicted by the energy model.     

Language Processing Differences Between Blind and Sighted Individuals and the Abstract Versus Concrete Concept Difference

In the property listing task (PLT), participants are asked to list properties for a concept (e.g., for the concept dog, “barks,” and “is a pet” may be produced). In conceptual property norming (CPNs) studies, participants are asked to list properties for large sets of concepts. Here, we use a mathematical model of the property listing process to explore two longstanding issues: characterizing the difference between concrete and abstract concepts, and characterizing semantic knowledge in the blind versus sighted population. When we apply our mathematical model to a large CPN reporting properties listed by sighted and blind participants, the model uncovers significant differences between concrete and abstract concepts. Though we also find that blind individuals show many of the same processing differences between abstract and concrete concepts found in sighted individuals, our model shows that those differences are noticeably less pronounced than in sighted individuals. We discuss our results vis-a-vis theories attempting to characterize abstract concepts.     

Jung,Winnicott and the divided psyche

In his review of Memories Dreams Reflections, Winnicott diagnosed Jung as suffering from a psychic split, and characterized the content and the structure of analytical psychology as primarily moulded and conditioned by Jung's own defensive quest for a ‘self that he could call his own’. This pathologizing analysis continues to be endorsed by contemporary Jungian writers. In this paper I attempt to show that Winnicott's critique is fundamentally misguided because it derives from a psychoanalytic model of the psyche, a model that regards all dissociation as necessarily pathological. I argue that Jung's understanding of the psyche differs radically from this model, and further, that it conforms by and large to the kind of dissociative model that we find in the writings of Frederic Myers, William James and Theodor Flournoy. I conclude that a fruitful relationship between psychoanalysis and analytical psychology must depend upon an awareness of these important differences between the two psychic models.     

Individual differences in the mixture ratio of rotation and nonrotation trials during rotated mirror/normal letter discriminations

Mental rotation is thought to underlie the increase in response times (RTs) for deciding whether rotated letters are normal or mirrored versions. However, mental rotation predicts a linear increase in RTs, whereas the mirror/normal letter discrimination task typically produces a curved function. Recently, Kung and Hamm suggested that this curved function results from a mixture of trials in which mental rotation is employed and trials in which it is not. The mixture ratio may vary between individuals, with some individuals relying more on mental rotation than others. There is no factor in the Kung and Hamm model that reflects such individual differences. In the present study, we suggest that a possible exponent parameter could be added to the Kung and Hamm model to capture individual differences in the mixture ratio. This exponent parameter appears to capture an individual characteristic since the value obtained correlates between the mirror/normal letter task and a left/right object facing task. The development of a quantity that represents the mixture ratio will aid further testing of processes involved in the visual imagery system.     

Discriminant validity of the MMPI for borderline personality disorder

This study explores the discriminant validity of the MMPI in relationship to the DSM-III and the Diagnostic Interview for Borderlines (DIB) constructs of Borderline Personality Disorder (BPD). A two-way analysis of variance model assessed differences between inpatients (n = 42) and outpatients (n = 42) and between BPD and nonBPD patients. We compare the best discriminant model for the current samples with previous BPD discriminant functions. The present study assesses a wider range of psychopathology in which the MMPI appears to be relatively insensitive to the BPD construct while retaining the high specificity reported in previous studies. Implications for the use of the MMPI as a diagnostic instrument are discussed.     

Smoking, body weight, and their effects on smoking behavior: a comprehensive review of the literature

This article provides a comprehensive review of the research on smoking and body weight. The relationships between smoking and body weight are evaluated in 70 cross-sectional and longitudinal investigations. The mechanisms responsible for differences in body weight are discussed, the weight-related issues that promote smoking behavior are reviewed, methods for reducing postcessation weight gain are summarized, and future research directions are proposed. A proposed working research model for studying the relationship between smoking, energy balance, and weight gain is offered. It is concluded that smoking and body weight relationships are closely related and pose significant challenges for smoking researchers.     

Gender Differences in the Choice of Computer Courses: Applying an Expectancy-Value Model

The choice of computer courses has a direct influence on the development of computer literacy. It is alarming, therefore, that girls seem to choose computer courses less frequently than boys. The present paper examines (a) whether these often-reported gender differences also occur at the early high school level (Study 1) and (b) how these differences can be predicted by applying an expectancy-value model to the domain of computing (Study 2). Both studies clearly show gender differences in the choice of computer courses in children between 10 and 16 years in the real-life situation of choosing courses at school. In Study 2, the suggested expectancy-value model is tested using data from 159 students and 137 parents. The model shows a good fit to the data, and the observed gender differences in the choice of computer course could be predicted by differences in the value placed on computers and the expectations of success. However, these differences could only be partly explained by differences in perceived parental attitudes, and there were only weak relationships between parental attitudes and the corresponding perceptions of the students. Educational implications of the findings and suggestions for future research are discussed.