Testing Group Mean Differences of Latent Variables in Multilevel Data Using Multiple-Group Multilevel CFA and Multilevel MIMIC Modeling

Considering that group comparisons are common in social science, we examined two latent group mean testing methods when groups of interest were either at the between or within level of multilevel data: multiple-group multilevel confirmatory factor analysis (MG ML CFA) and multilevel multiple-indicators multiple-causes modeling (ML MIMIC). The performance of these methods were investigated through three Monte Carlo studies. In Studies 1 and 2, either factor variances or residual variances were manipulated to be heterogeneous between groups. In Study 3, which focused on within-level multiple-group analysis, six different model specifications were considered depending on how to model the intra-class group correlation (i.e., correlation between random effect factors for groups within cluster). The results of simulations generally supported the adequacy of MG ML CFA and ML MIMIC for multiple-group analysis with multilevel data. The two methods did not show any notable difference in the latent group mean testing across three studies. Finally, a demonstration with real data and guidelines in selecting an appropriate approach to multilevel multiple-group analysis are provided.     

Single and Multiple Ability Estimation in the SEM Framework: A Noninformative Bayesian Estimation Approach

Latent variable models with many categorical items and multiple latent constructs result in many dimensions of numerical integration, and the traditional frequentist estimation approach, such as maximum likelihood (ML), tends to fail due to model complexity. In such cases, Bayesian estimation with diffuse priors can be used as a viable alternative to ML estimation. This study compares the performance of Bayesian estimation with ML estimation in estimating single or multiple ability factors across 2 types of measurement models in the structural equation modeling framework: a multidimensional item response theory (MIRT) model and a multiple-indicator multiple-cause (MIMIC) model. A Monte Carlo simulation study demonstrates that Bayesian estimation with diffuse priors, under various conditions, produces results quite comparable with ML estimation in the single- and multilevel MIRT and MIMIC models. Additionally, an empirical example utilizing the Multistate Bar Examination is provided to compare the practical utility of the MIRT and MIMIC models. Structural relationships among the ability factors, covariates, and a binary outcome variable are investigated through the single- and multilevel measurement models. The article concludes with a summary of the relative advantages of Bayesian estimation over ML estimation in MIRT and MIMIC models and suggests strategies for implementing these methods.     

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.     

Constraints on Arm Selection Processes When Reaching: Degrees of Freedom and Joint Amplitudes Interact to Influence Limb Selection

With an interest in identifying the variables that constrain arm choice when reaching, the authors had 11 right-handed participants perform free-choice and assigned-limb reaches at 9 object positions. The right arm was freely selected 100% of the time when reaching to positions at 30° and 40° into right hemispace. However, the left arm was freely selected to reach to positions at ?30° and ?40° in left hemispace 85% of the time. A comparison between free- and assigned-limb reaching kinematics revealed that free limb selection when reaching to the farthest positions was constrained by joint amplitude requirements and the time devoted to limb deceleration. Differences between free- and assigned-arm reaches were not evident when reaching to the midline and positions of ±10°, even though the right arm was freely selected most often for these positions. Different factors contribute to limb selection as a function of distance into a specific hemispace.     

The uncomfortable truth about wrongful life cases

Our ambivalent attitudes toward the notion of ‘a life worth living’ present a philosophical puzzle: Why are we of two minds about the birth of a severely disabled child? Is the child’s life worth living or not worth living? Between these two apparently incompatible evaluative judgments, which is true? If one judgment is true and the other false, what makes us continue to find both evaluations appealing? Indeed, how can we manage to hold these inconsistent judgments simultaneously at all? I critically examine two solutions to this puzzle: the hidden-indexical account and Velleman’s anti-realist account. I propose an alternative explanation which appeals to (a) state-given, as opposed to object-given, reasons for belief and (b) the distinction between belief and acceptance. I argue that (1) the fact that a severely disabled life is not worth living provides object-given reason to believe that that life is not worth living, but (2) after the birth of a severely disabled child, the psychological utility of positive evaluation gives us a state-given reason to believe that that child’s life is worth living, and a reason to accept that, in our relation with the child, her life is worth living. I conclude by drawing a practical lesson about wrongful life suits.     

A Mediated Moderation Model of Recruiting Socially and Environmentally Responsible Job Applicants

Socially and environmentally responsible organizations must attend to the fit of employees with the values of the organization. Recruiting practices are a key tool for ensuring fit with an organization's culture and values. We develop and test a model of the process through which recruitment information about an organization's social and environmental responsibility values differentially affect job seeker perceived fit, attraction, and job pursuit intentions depending on job seekers’ desire to have a significant impact through work. Our model of mediated moderation is tested with a sample of 339 actual job seekers using conditional process modeling and nonlinear bootstrapping techniques. Results support expectations that advertisement messages about an organization's social and environmental responsibility values interact with applicants’ desire to have a significant impact through work to influence job pursuit intentions through the hypothesized mediational process. Implications of the model for research on recruitment and organizational social and environmental responsibility are discussed.     

Transforming Fatherhood: Reconstructing Fatherhood Through Faith-Based Father School in South Korea

Despite the fast growing literature on religion and fatherhood, the majority of research on the topic was conducted in western societies, and the linkage between culture, religion, and fatherhood was understudied. Using in-depth interviews with 20 Korean fathers who completed an evangelical Duranno Father School (DFS) program, this study examines the processes through which they reconstruct fatherhood and become involved fathers in contemporary South Korean society. Results show the DFS program is instrumental in the reconstruction of new fatherhood through the provision of a strong moral foundation. The transformational processes of fatherhood are initiated and sustained within men’s relationships and interactions with families and religious communities in South Korean cultural context. However, reconstructing a new form of fatherhood is a daunting task and the processes of change are marked with constant tensions between old practices and new ways of doing fatherhood. Men must consciously make efforts to sustain new fatherhood through various means and strategies until new fatherhood becomes familiar. This Korean case suggests the significance of looking into the distinctive roles of religion in the processes of reconstruction of fatherhood, particularly in “unsettled times” characterized by social transformation. Implications of the findings for future research are discussed.     

A Virtual View of Managing Violence among British Escorts

It is no secret that men seeking to victimize women often select women who work as prostitutes. More is known about the violence experienced by women who work as street prostitutes than those who work indoor as escorts. This article reports two main types of violence reported by British escorts on an Internet site set up specifically for the escorts to share information with one another. Physical violence and electronic abuse are common experiences for those reporting on an Internet website. The focus of the article, however, is how women working as escorts experience these two types of violence in their work and the risk management strategies they employ to maintain their safety. To combat personal violence, women who work as escorts employ practical safety precautions before and during appointments as well as emotional labor during interactions with clients. However, with the changing nature of escorting brought about by the Internet, this article highlights a new threat to women working in escorting: electronic abuse for which there are few solutions at this point.     

Between Good and Evil: Xunzi’s Reinterpretation of the Hegemonic Rule as Decent Governance

This essay investigates Xunzi’s political philosophy of ba dao (Hegemonic Rule). It argues that Xunzi’s practical philosophy of ba dao was developed in the course of resolving the tension between theory and practice latent in Mencius’s account of ba dao. Its central claim is that contra Mencius who remained torn between his ideal political theory of ba dao and the practical utility and moral value of ba dao, Xunzi creatively re-appropriated ba dao as a “morally decent” (if not morally ideal) statecraft, within the parameter of practical Confucian philosophy. After examining the moral and political value of ba dao in both domestic and international governance, the essay concludes by arguing that Xunzi’s defense of ba dao should be understood in the context of what I call “negative Confucianism,” without which the realization of the Confucian moral-political ideal (or positive Confucianism) is impossible.     

Development of a simple MR-compatible vibrotactile stimulator using a planar-coil-type actuator

For this study, we developed a magnetic resonance (MR)-compatible vibrotactile stimulator using a planar-coil-type actuator. The newly developed vibrotactile stimulator consists of three units: control unit, drive unit, and planar-coil-type actuator. The control unit controls frequency, intensity, time, and channel, and transfers the stimulation signals to the drive unit. The drive unit operates the planar-coil-type actuator in response to commands from the control unit. The planar-coil-type actuator, which uses a planar coil instead of conventional electric wire, generates vibrating stimulation through interaction of the current of the planar coil with the static magnetic field of the MR scanner. Even though the developed tactile stimulating system is small, simple, and inexpensive, it has a wide range of stimulation frequencies (20 ~ 400 Hz, at 40 levels) and stimulation intensities (0 ~ 7 V, at 256 levels). The stimulation intensity does not change due to frequency changes. Since the transient response time is a few microseconds, the stimulation time can be controlled on a scale of microseconds. In addition, this actuator has the advantages of providing highly repeatable stimulation, being durable, being able to assume various shapes, and having an adjustable contact area with the skin. The new stimulator operated stably in an MR environment without affecting the MR images. Using functional magnetic resonance imaging, we observed the brain activation changes resulting from stimulation frequency and intensity changes.