Regression Mixture Models: Does Modeling the Covariance Between Independent Variables and Latent Classes Improve the Results?

Regression mixture models are increasingly used as an exploratory approach to identify heterogeneity in the effects of a predictor on an outcome. In this simulation study, we tested the effects of violating an implicit assumption often made in these models; that is, independent variables in the model are not directly related to latent classes. Results indicate that the major risk of failing to model the relationship between predictor and latent class was an increase in the probability of selecting additional latent classes and biased class proportions. In addition, we tested whether regression mixture models can detect a piecewise relationship between a predictor and outcome. Results suggest that these models are able to detect piecewise relations but only when the relationship between the latent class and the predictor is included in model estimation. We illustrate the implications of making this assumption through a reanalysis of applied data examining heterogeneity in the effects of family resources on academic achievement. We compare previous results (which assumed no relation between independent variables and latent class) to the model where this assumption is lifted. Implications and analytic suggestions for conducting regression mixture based on these findings are noted.     

Different Strokes in Boundary Artistry: Commentary on Cooper’s “Blurring Boundaries or Why Do We Refer to Sexual Misconduct With Patients as ‘Boundary Violation’”

In this commentary, the useful idea of psychoanalytic process as boundary art is taken up, elaborated, and further conceptualized. Two registers of psychic experience are utilized: the mutual and asymmetric modes of relating inherent in and definitional of analytic process. In line with Steven H. Cooper’s ideas, the givenness of boundaries in the mutual realm constitute the psychic matter of self-other differentiation. In contrast, the asymmetrical register marks boundaries as asserted and intended to be actualized in behavior. The usefulness of “boundary violation” as an expression of a perversion of ethical commitments is construed as a justified and necessary phrase. Boundaries in the asymmetrical register, continually asserted, make play and flex in the mutual register possible and in this way form a dialectical relation. In concert with Cooper, these assertions reflect the power of boundaries to ‘allow us to get lost.’ Fallibilities in the ways theories can be coopted to erase (and thereby truncate) aspects of the psychoanalytic process are described as a misuse (violation?) of boundary art.     

A Different Approach in Developing a Sexual Self-Concept Scale for Adolescents in Accra,Ghana

Adolescents residing in urban poor Accra face sexual and reproductive health challenges. Interventions to address them have not been entirely effective; thus, researching adolescents’ sexual self-concept (SSC) could strengthen our understanding of precursors to their sexual activity. For this study, a culturally appropriate scale is developed to measure the SSC of adolescents in urban poor Accra. Focus group discussions and content analysis generated items in the scale. Factor analyses techniques were used to develop sub-scales measuring different SSC dimensions. Three sub-scales, ‘sexual enthusiasm’, ‘sexual intrepidness’ and ‘sexual readiness’ were reliable SSC measures. Validity assessments found that sexually ready and enthusiastic youth were more likely to have engaged in coital, pre-coital and risky sexual behaviors. Also, as their sexual intrepidness and enthusiasm increased, adolescents had significantly worse mental health. These scales may provide an important step in understanding adolescent sexual behavior in the urban poor context and thus need further investigation.     

Maltreated and Comparison Adolescents’ Recollections of Lifetime Residences: Relationship to Delinquency and Marijuana Use

This study of child welfare-affiliated maltreated youth (n?=?216) and comparison youth (n?=?128) from the same community (age M?=?18.21, SD?=?1.42) examined: 1. whether child/caregiver characteristics and maltreatment status were associated with lifetime number of residences; and 2. whether child/caregiver characteristics, residences, and maltreatment status were associated with delinquency and marijuana use. Maltreatment status, ever living with a nonparent caregiver, and being older were associated with more residences during childhood. More residences and male sex were associated with person offense delinquency and marijuana use. It is important to help caregivers who live in disadvantaged neighborhoods, especially families with child welfare involvement, understand the behavioral consequences of a high number of residences during childhood and adolescence and provide support for stable long-term housing.     

Entering Prostitution in Adolescence: History of Youth Homelessness Predicts Earlier Entry

The effect of youth homelessness on age of entry into prostitution was tested, controlling for other known covariates using a multivariate model. Women (N = 96) who self-identified as having engaged in prostitution completed cross-sectional standardized questionnaires (M_age = 42.6, SD = 9.18; 62% African American). Women with a history of youth homelessness entered prostitution nearly 8 years earlier than their peers without this history (at 18 vs. 25 years old). Lack of a high school degree or equivalent also predicted an earlier age of entry (at 20 vs. 28 years old). Findings highlight the poverty dynamics that underlie the relationship between early entry into prostitution and homelessness. Young women, living on the street or in shelters, with limited education and employment opportunities, are at high risk of entering prostitution when they are barely out of adolescence. Future research will be better able to design age-specific prevention strategies.     

Spatial Proportional Reasoning Is Associated With Formal Knowledge About Fractions

Proportional reasoning involves thinking about parts and wholes (i.e., about fractional quantities). Yet, research on proportional reasoning and fraction learning has proceeded separately. This study assessed proportional reasoning and formal fraction knowledge in 8- to 10-year-olds. Participants (N = 52) saw combinations of cherry juice and water in displays that highlighted either part–whole or part–part relations. Their task was to indicate on a continuous rating scale how much each mixture would taste of cherries. Ratings suggested the use of a proportional integration rule for both kinds of displays, although more robustly and accurately for part–whole displays. The findings indicate that children may be more likely to scale proportional components when being presented with part–whole as compared with part–part displays. Crucially, ratings for part–whole problems correlated with fraction knowledge, even after controlling for age, suggesting that a sense of spatial proportions is associated with an understanding of fractional quantities.     

MATERNAL SELF‐REPORTED DEPRESSIVE SYMPTOMS AND MATERNAL CORTISOL LEVELS INTERACT TO PREDICT INFANT CORTISOL LEVELS

Three basic findings have emerged from research on maternal depressive symptoms and offspring hypothalamic–pituitary–adrenal functioning: (a) Mothers’ depressive symptoms are positively associated with their offsprings’ cortisol stress response, (b) numerous individual and interpersonal maternal characteristics moderate this association, and (c) maternal and infant cortisol levels are highly correlated. In combination, these findings have suggested that maternal cortisol levels may moderate the relation between maternal depressive symptoms and infant cortisol responsivity; the current study assessed this hypothesis. Participants were 297 mother–infant dyads who were recruited from the community. Maternal depressive symptoms were assessed via self‐report. Dyads participated in two differentially stressful infant challenges when infants were 16 and 17 months old. Mother and infant salivary cortisol was collected before and after challenges. Results indicate that maternal cortisol levels moderated associations between maternal depressive symptoms and infant cortisol levels across both challenges. Infants showed higher cortisol levels if their mothers had both higher depressive symptoms and higher cortisol levels, as compared to infants of mothers with higher depressive symptoms and lower cortisol, and to infants of mothers with lower depressive symptoms and either higher or lower cortisol levels. We discuss findings in relation to environmental and biological factors that may contribute to the intergenerational transmission of depressive symptoms.     

Possibility and Consciousness in Husserl’s Thought

Clarifying the nature of possibility is crucial for an evaluation of the phenomenological approach to ontology. From a phenomenological perspective, it is ontological possibility, and not spatiotemporal existence, that has pre-eminent ontological status. Since the sphere of phenomenological being and the sphere of experienceability turn out to be overlapping, this makes room for two perspectives. We can confer foundational priority to the acts of consciousness over possibilities, or to pre-set possibilities over the activity of consciousness. Husserl’s position on this issue seems to change over time. Ultimately, the establishment of a phenomenological perspective must involve a rejection of any hypostatization of pre-set possibilities, but not all implications of this theoretical step seem to be drawn in Husserl’s texts. This paper is devoted to an illustration of how the phenomenological notion of possibility should change when we reject the hypostatization of possibility, that is, when we reject the idea that all acts of consciousness are to be conceived as realizations of pre-set “ideal forms”. We examine this question, first, by trying to clarify the conceptual constellation of “possibility” in Husserl’s texts. This leads to an overall classification of the features of constituted (ontic) possibilities. Then we distinguish such constituted possibilities from their constituting conditions, which outlines a different sense of “possibility”. In the last instance two “possibilizing” dimensions (transcendental motivation and transcendental contingency) are shown to lie at the root of all ontic possibilities. This leads to a final suggestion on the nature of the relation between experience and possibility. Actual experiences create the room for possibility: they are possibilizations (Ermöglichungen). In this sense, experience is to be taken as a generative sphere which goes beyond the customary boundary between epistemic and ontological. From this point of view all experience is to be conceived as emergence .