Consistency of Cluster Analysis for Cognitive Diagnosis: The Reduced Reparameterized Unified Model and the General Diagnostic Model

The asymptotic classification theory of cognitive diagnosis (ACTCD) provided the theoretical foundation for using clustering methods that do not rely on a parametric statistical model for assigning examinees to proficiency classes. Like general diagnostic classification models, clustering methods can be useful in situations where the true diagnostic classification model (DCM) underlying the data is unknown and possibly misspecified, or the items of a test conform to a mix of multiple DCMs. Clustering methods can also be an option when fitting advanced and complex DCMs encounters computational difficulties. These can range from the use of excessive CPU times to plain computational infeasibility. However, the propositions of the ACTCD have only been proven for the Deterministic Input Noisy Output “AND” gate (DINA) model and the Deterministic Input Noisy Output “OR” gate (DINO) model. For other DCMs, there does not exist a theoretical justification to use clustering for assigning examinees to proficiency classes. But if clustering is to be used legitimately, then the ACTCD must cover a larger number of DCMs than just the DINA model and the DINO model. Thus, the purpose of this article is to prove the theoretical propositions of the ACTCD for two other important DCMs, the Reduced Reparameterized Unified Model and the General Diagnostic Model.     

A General Method of Empirical Q-matrix Validation

In contrast to unidimensional item response models that postulate a single underlying proficiency, cognitive diagnosis models (CDMs) posit multiple, discrete skills or attributes, thus allowing CDMs to provide a finer-grained assessment of examinees’ test performance. A common component of CDMs for specifying the attributes required for each item is the Q-matrix. Although construction of Q-matrix is typically performed by domain experts, it nonetheless, to a large extent, remains a subjective process, and misspecifications in the Q-matrix, if left unchecked, can have important practical implications. To address this concern, this paper proposes a discrimination index that can be used with a wide class of CDM subsumed by the generalized deterministic input, noisy “and” gate model to empirically validate the Q-matrix specifications by identifying and replacing misspecified entries in the Q-matrix. The rationale for using the index as the basis for a proposed validation method is provided in the form of mathematical proofs to several relevant lemmas and a theorem. The feasibility of the proposed method was examined using simulated data generated under various conditions. The proposed method is illustrated using fraction subtraction data.     

Depression moderated the effect of exposure to suicide news on suicidality among college students in Taiwan

The present study was designed to examine whether age, gender, and depression level may moderate the effect of exposure to suicide news on the suicidality of college students in Taiwan. A representative sample of 3,222 college students were recruited from Southern Taiwan with a total of 2,602 useable surveys returned. Results showed that only depression level reached a significant moderating effect and further examination showed that the exposure to suicide news significantly predicted suicidality solely in the severely depressed group.     

Perceived cultural importance and actual self-importance of values in cultural identification

Cross-cultural psychologists assume that core cultural values define to a large extent what a culture is. Typically, core values are identified through an actual self-importance approach, in which core values are those that members of the culture as a group strongly endorse. In this article, the authors propose a perceived cultural importance approach to identifying core values, in which core values are values that members of the culture as a group generally believe to be important in the culture. In 5 studies, the authors examine the utility of the perceived cultural importance approach. Results consistently showed that, compared with values of high actual self-importance, values of high perceived cultural importance play a more important role in cultural identification. These findings have important implications for conceptualizing and measuring cultures.     

Recommendations from Multi-disciplinary Focus Groups on Cascade Testing and Genetic Counseling for Fragile X-associated Disorders

The purpose of this paper is to report the outcome of a collaborative project between the Fragile X Research and Treatment Center at the Medical Investigation of Neurodevelopmental Disorders (M.I.N.D.) Institute at the University of California at Davis, the National Fragile X Foundation (NFXF), and the Centers for Disease Control and Prevention (CDC). The objective of this collaboration was to develop and disseminate protocols for genetic counseling and cascade testing for the multiple disorders associated with the fragile X mental retardation 1 (FMR1) mutation. Over the last several years, there has been increasing insight into the phenotypic range associated with both the premutation and the full mutation of the FMR1 gene. To help develop recommendations related to screening for fragile X-associated disorders, four, two day advisory focus group meetings were conducted, each with a different theme. The four themes were: (1) fragile X-associated tremor/ataxia syndrome (FXTAS); (2) premature ovarian failure (POF) and reproductive endocrinology; (3) psychiatric, behavioral and psychological issues; and (4) population screening and related ethical issues.     

Satellite babies in transnational families: A study of parents' decision to separate from their infants

This study examines a practice which is characteristic of an era of intensifying globalization: As part of a transnational lifestyle, an increasing number of immigrants to North America send infants thousands of miles back to their country of origin to be raised by members of their extended families—a culturally sanctioned tradition. After several years of separation, the children return to the biological parents to attend school in the adopted country, a custom which, according to Western mental health models, could have significant sequelae for attachment relationships and other facets of development. This practice is particularly prevalent among immigrants from the People's Republic of China, but a modified version of it can be found in other groups as well. The work described here is the first phase of a longitudinal project that explores the advantages and potential repercussions, for both infants and parents, of a transnational lifestyle. The current study reviews the decision‐making process of a group of Chinese Canadian immigrant parents who are considering a separation from their infants. Preliminary findings show that the expected concerns about disrupting attachment relationships are embedded in more salient considerations of economic need and cultural perspective. These exploratory data exemplify an emergent field of culture‐focused research and practice in infant mental health, and support the call for innovative models to situate infant developmental pathways in global and transcultural contexts.