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

Daniel T. Lythgoe  Marta Garcia-Fiñana  Trevor F. Cox 《Structural equation modeling》2019,26(1):51-65

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.

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The Right “Fit”: Exploring Science Teacher Candidates’ Approaches to Natural Selection Within a Clinical Simulation     

Benjamin Dotger  Sharon Dotger  Joanna Masingila  Jeffrey Rozelle  Mary Bearkland  Ashley Binnert 《Research in Science Education》2018,48(3):637-661

Teachers and students struggle with the complexities surrounding the evolution of species and the process of natural selection. This article examines how science teacher candidates (STCs) engage in a clinical simulation that foregrounds two common challenges associated with natural selection—students’ understanding of “survival of the fittest” and the variation of species over time. We outline the medical education pedagogy of clinical simulations and its recent diffusion to teacher education. Then, we outline the study that situates each STC in a one-to-one interaction with a standardized student who is struggling to accurately interpret natural selection concepts. In simulation with the standardized student, each STC is challenged to recognize content misconceptions and respond with appropriate instructional strategies and accurate explanations. Findings and implications center on the STCs’ instructional practices in the simulation and the use of clinical learning environments to foster science teacher learning.  相似文献   

Illustrating the Dangers of Hunting the Process Mean     

Jeffrey Dodgson 《Teaching Statistics》1992,14(2):14-17

This article describes two simple ways to illustrate the important concept in statistical process control known as “hunting”. The two simulations use dice and Minitab respectively.  相似文献   

Relative Effects of a Comprehensive Versus Reduced Training for Head Start Teachers Who Serve Spanish-Speaking English Learners     

Emily J. Solari  Tricia A. Zucker  Susan H. Landry  Jeffrey M. Williams 《Early education and development》2016,27(7):1060-1076

With increased demand for improved early childhood education services, it is important to better understand the essential professional development resources that have the greatest impact on both teacher and child outcomes. This study compared the effectiveness of two teacher-training models in bilingual Migrant and Seasonal Head Start and Head Start classrooms. Both conditions included the use of a technology-based student progress-monitoring tool. The progress monitoring provided detailed feedback on students’ progress 15 across the academic year and helped organize instructional groupings. The comprehensive treatment condition included biweekly professional development sessions, in-class mentoring, and provision of classroom materials, whereas the treatment-control condition included only the provision of a limited set of classroom materials. Across multiple sites in Texas, 49 pretest and posttest teacher observations and bilingual child assessments were collected on a subsample of students (n = 387). Research Findings: Improvements in teaching behaviors were observed in both experimental conditions; no significant differences were observed between teachers across conditions. Three measures of child language and literacy growth differed significantly, favoring the comprehensive treatment model, but most outcomes did not differ significantly between groups. Practice or Policy: Implications of these mixed findings and future research directions are discussed.  相似文献   

Parental substance abuse and the nature of child maltreatment.     

R Famularo  R Kinscherff  T Fenton 《Child abuse & neglect》1992,16(4):475-483

The authors reviewed 190 randomly selected records from the case load of a large juvenile court. These records involved cases in which the state took legal custody of the children following a finding of significant child maltreatment, based on a "clear and convincing" standard of evidence. Sixty-seven percent (127/190) of these cases involved parents who were classified as substance abusers. The results of this study revealed specific associations between (a) alcohol abuse and physical maltreatment and (b) cocaine abuse and sexual maltreatment. Logistic analyses, testing for the effects of polysubstance abuse, revealed that additional forms of substance abuse failed to add significantly to the effects of alcohol in predicting physical maltreatment or cocaine in predicting sexual maltreatment.  相似文献   

The relative effects of pre- and postattention directing devices on learning from a “walk-through” museum exhibit     

John J. Koran  Jeffrey R. Lehman  Lynn D. Shafer  Mary Lou Koran 《科学教学研究杂志》1983,20(4):341-346

Twenty-eight seventh and eighth grade students were randomly assigned to two treatments and a control as they entered the Florida State Museum. All subjects were given set induction materials saying in effect: (1) Treatment-Study the wall panel which is part of the cave exhibit and describes the many biologic relationships and organisms in the cave at the cave entrance. Continue into the cave and study the habitat. When you exit the cave you will be given a test to see how much you learned; (2) Treatment II-Enter the cave and study that habitat. When you exit at the other end, study the wall panel which is part of the cave exit and describes the many biologic relationships and organisms in the cave. After studying this panel you will be given a test to see how much you learned; (3) Control-You will take a walk through exhibits depicting a variety of Florida Habitats and later see a film on the Habitats of Florida that are represented in the museum. Then you will be given a test to determine how much you know about one type of habitat. Both treatments and the control spent equivalent time at their tasks and were confronted with either the cave exhibit as described or the equivalent control experiences. A 25 item criterion test was designed to measure the acquisition of conceptual and factual knowledge and specific attentional factors relative to both the cave and the instructional panel. A Kr-20 indicated that this instrument had a reliability coefficient of 0.80. It was anticipated that the panel, used as an attention directing and controlling device prior to entering the cave (Treatment I) or upon exiting the cave (Treatment II), would function as a forward-shaping or backward review prompting adjunct, hence both should be significantly more effective than the control. This was confirmed (df 2,28; F 8.09) p < 0.01. It was also expected that the forward shaping panel would be more effective than the backward review panel in the tradition of inserted questions in prose research. Although the differences were in this direction, they were not significant (p≤ 0.10).  相似文献   

Fostering Teacher Educators’ Professional Development on Practice-Based Research Through Communities of Inquiry     

T. Martijn Willemse  Fer Boei  Marieke Pillen 《Vocations and Learning》2016,9(1):85-110

Practice-based research and supervising students’ research has become an important task for higher vocational institutes, including the teacher education departments. However, conducting practice-based research is not always common practice for a great number of teacher educators. Therefore, professional development activities are undertaken to support teacher educators in their new role as a researcher. This paper reports on one of those activities: a community of inquiry in which teacher educators conducted a collaborative research on a shared topic derived from their practices, in order to examine teacher educators’ professional development and to identify key characteristics for setting up such a community. All participants reported developments in practice-based research skills and knowledge, and developments regarding supervising students’ research. In addition, they reported on developments in their beliefs regarding research and on the topic under research. They also reported the impact of the community on other parts of their profession. Commitment, time, teacher educators as experienced researchers and completing the research stages are identified as key characteristics.  相似文献   

After heated debate, U.S. House votes again to ban cloning     

Brainard J 《The Chronicle of higher education》2003,49(27):A24

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Using quality enhancement processes to achieve sustainable development and support for sessional staff     

D. Lekkas  T. A. Winning 《International Journal for Academic Development》2017,22(1):70-83

Abstract

Consistent with quality enhancement, we report on how we used a continuous improvement cycle to formalise and embed an academic development and support programme for our School’s sessional staff. Key factors in establishing and maintaining the programme included: local change agents supported initially by institutional project funding; School support for key academic and administrative roles; timely access to reports and tools from nationally-funded projects and sessional staff input. Reviewing our approach against national standards highlighted ongoing actions while collaboration with academic developers is critical for advancing our understanding and reviewing our approaches in our continuously changing context.  相似文献   

In the Midst of Doubled Imaginaries: The Pacific Community as Diversity and as Difference   总被引：1，自引：0，他引：1  

Ted T. Aoki 《Interchange》1999,30(1):27-38

How shall we understand the signified "community" as in a Pacific Community? Conventional understanding of "community" privileges community understood as diversity, a collective of multiple identifiers of cultures and nations (as in multiculturalism or multinationalism). Postcolonialists, like Stuart Hall and Homi Bhabha, claim that such imaginary is inscribed in "democractic liberalism," suppressing, concealing, and containing the imaginary of "community as difference." In this article, the author calls upon readers to move boldly into the interspace midst these two imaginaries, and claims that though it is a site of ambiguity, ambivalence, and uncertainty, it may be a site of generative possibilities and hope for newness, a site of becoming in struggle.  相似文献