Latent Class Modeling with A Time-To-Event Distal Outcome: A Comparison of One,Two and Three-Step Approaches

Latent class methods can be used to identify unobserved subgroups which differ in their observed data. Researchers are often interested in outcomes for the identified subgroups and in some disciplines time-to-event outcome measures are common, e.g., overall survival in oncology. In this study Monte Carlo simulation is used to evaluate the empirical properties of latent class effect estimates on a time-to-event distal outcome using one, two and three-step approaches. Both standard and inclusive bias-corrected three-step approaches are considered. One-step latent class effect estimates are shown to be superior to the evaluated alternatives. Both the two-step approach and a standard three-step approach, where subjects are partially assigned to latent classes, produced unbiased estimates with nominal confidence interval coverage when latent classes were well separated, but not otherwise.

     

In the interests of the child: psychiatry,adoption, and the emancipation of the single mother and her child – the case of the Netherlands (1945–1970)

ABSTRACT

This paper discusses illegitimacy and single motherhood in the postwar period in the Netherlands from the perspective of what was considered to be in the interests of the child: being adopted by a married couple or being raised by the birthmother. It focuses particularly on the impact of psychiatry and the legalization of adoption in 1956 on the emancipation of the single mother and her child. The paper argues that the release of single motherhood and illegitimacy from the moral-religious stigmata of a “sinful fallen woman” and a “damned” or “degenerated” child has, in the Dutch case, not proceeded as a linear process. The process of emancipation toward proud and independent lone motherhood stagnated in the 1950s and 1960s because, when adoption was legalized, illegitimacy became an issue over which scientists, especially psychiatrists, gained the power of expert control. Guided by dynamic psychology and what they conceived of as the best interests of the child they declared single mothers to be victims of “sociopathology” and, consequently, unfit for motherhood. Adoption became the preferred option. This medicalised approach continued to dominate until the reawakening of feminism in the late 1960s made self-sufficient lone motherhood once more a respectable choice.     

Justification and Persuasion about Cloning: Arguments in Hwang’s Paper and Journalistic Reported Versions

We examine the argumentative structure of Hwang et al.’s (2004) paper about human somatic cell nuclear transfer (SCNT, or ‘therapeutic cloning’), contrasted with four Journalistic Reported Versions (JRV) of it, and with students’ summaries of one JRV. As the evaluation of evidence is one of the critical features of argumentation (Jiménez-Aleixandre 2008), the analysis focuses on the use of evidence, drawing from instruments to analyze written argumentation (Kelly et al. 2008) and from studies about the structure of empirical research reports (Swales 2001). The objectives are: 1) To examine the use of evidence and the argumentative structure of Hwang et al.’s Science, 303: 1669–1674 (2004) original paper in terms of the criteria: a) pertinence of the evidence presented to the claims; b) sufficiency of the evidence for the purpose of supporting the claims; and c) coordination of the evidence across epistemic levels. 2) To explore how the structure of Hwang’s paper translates into the JRV and into university students’ perceptions about the evidence supporting the claims. The argumentative structure of Hwang’s paper is such that its apparently ostensible main claim about NT constitutes a justification for a second claim about its therapeutic applications, for which no evidence is offered. However, this second claim receives prominent treatment in the JRV and in the students’ summaries. Implications for promoting critical reading in the classroom are discussed.     

Supporting Teaching and Learning Using Authentic Scientific Texts: A Rejoinder to Danielle J. Ford

In her commentary Danielle J. Ford mainly focused on three issues that highlight the promises and challenges for the use of Adapted Primary Literature (APL) in science curricula: the possible contribution of APL to authentic experiences in secondary schools, implementation issues of APL including the support required for the teachers, and the possibilities to extend the use of APL to younger and older students. In this rejoinder, we first offer some general comments on Ford’s commentary. Then we offer more specific comments on two areas of her response, authenticity and the support for teachers.     

Effects from audit culture and neoliberalism on university teaching: an autoethnographic perspective

Spanish university culture revolves mainly around the evaluation of professionals on the basis of the amount of work published in high-impact journals (weight assessments). The paper is shaped as an autoethnography, focusing mainly on the author’s life at university. Data collection and analysis set off from 2011, during the lecturer’s first year of working at university. The research aims principally at reflecting upon the highly demanding processes undergone by a lecturer, which might have a negative impact on other personal and professional domains. However, we also seek to show the weaknesses of the accreditation system as well as to consider the need to design a system that is able to put the emphasis back on the value of real academic work.     

Cinema experiences at school: assemblages as encounters with subjectivities

The aim of this article is to analyse how 15 students at a public elementary school detach from immobile representations of identity through aesthetic self-expressive work with cinema. Drawing on Deleuze and Guattari’s concept of assemblage, I interrogate students’ experiences of discrimination and challenge their processes of developing a short film within cinema workshops at school. I find that when new components regarding cinema, such as material apparatuses (e.g. cameras, stages, sound recorders) and expressive devices (e.g. improvisation, dialogues, corporeal movements), are applied to both the school and subjectivities, there is a rupture of rigid systems of representation and the creation of novel assemblages.     

An examination of Hispanic college enrollment and graduation: Has the Texas Closing the Gaps plan been successful?

The purpose of this study is to assess the effectiveness of the Texas “Closing the Gaps by 2015” plan to increase Hispanic enrollment into and graduation from institutions of higher education. This study uses Interrupted Time Series with Comparison Group to analyze 26 years of student cohorts in Texas universities. Controlling for historical enrollment and graduation growth as well as population growth, the results show that Hispanic college enrollment significantly increased as a result of the plan, but graduation did not. Several recommendations are offered for those states that wish to emulate Texas policies of increasing college enrollment and graduation of Hispanics.     

Retroactive interference effects of mentally imagined movement speed

In two retroactive interference experiments, we assessed the effect of mentally imagined movement speed on subsequent motor performance. All participants performed a sequential motor action at three speeds during a baseline test and a retention test. During the retention interval of Experiment 1, the participants (n = 50) physically performed the action at a slow speed, physically performed it at a fast speed, imagined it at a slow speed, imagined it at a fast speed, or performed a no-practice control task. In Experiment 2, the participants (n = 24) imagined the movement, overtly vocalized words, or both, all at a slow speed. The results revealed that the speed of the imagined motor action affected the speed of subsequent performance in the retention test and that imagery and physical practice were functionally equivalent. The results are consistent with Lang's bio-informational theory.     

Changes in the perception of action possibilities while climbing to fatigue on a climbing wall

Abstract

In two experiments we examined changes in the perception of action possibilities as a function of exertion. In Experiment 1, participants repeatedly climbed on a climbing wall in a series of trials that progressively increased in number to 10 trials, resulting in increased exertion. Before and during climbing, the participants judged their maximum reaching height and perceived exertion. On a separate day, participants climbed another 10 trials while performing actual maximum reaches. Higher perceived exertion was associated with decreases in perceived maximum reach while the actual reaches did not decrease. However, the perceptual changes occurred early during task execution when the participants were not yet fatigued. When exertion set in, neither perceived nor actual maximum reaching appeared to be affected. In Experiment 2, we included exhaustion trials. The findings replicated the early changes in perception observed in Experiment 1, which may be explained by hands-on experience with the task. Furthermore, while climbing to exhaustion, perceptual judgements largely changed in keeping with changes in the actual maximum reach. Thus, there appeared to be a functional relationship between participants' actual action capabilities, rather than their state of physical fatigue per se, and perceived action possibilities.