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Axel Mayer Nora Umbach Barbara Flunger Augustin Kelava 《Structural equation modeling》2017,24(4):556-570
In this article, we present an approach for comprehensive analysis of the effectiveness of interventions based on nonlinear structural equation mixture models (NSEMM). We provide definitions of average and conditional effects and show how they can be computed. We extend the traditional moderated regression approach to include latent continous and discrete (mixture) variables as well as their higher order interactions, quadratic or more general nonlinear relationships. This new approach can be considered a combination of the recently proposed EffectLiteR approach and the NSEMM approach. A key advantage of this synthesis is that it gives applied researchers the opportunity to gain greater insight into the effectiveness of the intervention. For example, it makes it possible to consider structural equation models for situations where the treatment is noneffective for extreme values of a latent covariate but is effective for medium values, as we illustrate using an example from the educational sciences. 相似文献
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Axel Gelfert 《Science & Education》2014,23(3):589-607
Edgar Allan Poe’s standing as a literary figure, who drew on (and sometimes dabbled in) the scientific debates of his time, makes him an intriguing character for any exploration of the historical interrelationship between science, literature and philosophy. His sprawling ‘prose-poem’ Eureka (1848), in particular, has sometimes been scrutinized for anticipations of later scientific developments. By contrast, the present paper argues that it should be understood as a contribution to the raging debates about scientific methodology at the time. This methodological interest, which is echoed in Poe’s ‘tales of ratiocination’, gives rise to a proposed new mode of—broadly abductive—inference, which Poe attributes to the hybrid figure of the ‘poet-mathematician’. Without creative imagination and intuition, Science would necessarily remain incomplete, even by its own standards. This concern with imaginative (abductive) inference ties in nicely with his coherentism, which grants pride of place to the twin virtues of Simplicity and Consistency, which must constrain imagination lest it degenerate into mere fancy. 相似文献
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Axel Hagermann 《Higher Education Quarterly》2009,63(2):196-206
A gradual shift in United Kingdom research funding from blanket financing by government agencies towards more diversified income streams through activities funded by various customers is prompting academic research institutions to orient their research portfolios accordingly. Academic organisations such as university institutes are increasingly relying on the funding obtained through research projects paid for by other customers than national funding bodies, thus diversifying their operations. Wrong choices in this diversification process can, however, have serious financial or operational implications for the organisation. A framework is proposed that should help enable academic institutes to rationalise their decision-making processes when seeking external funding for their operations through project grants or research contracts and learn from projects. 相似文献
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Axel Philipps 《Popular Communication》2015,13(3):183-201
Even in this media-centric age of the Internet, newspapers, television, and social networking, election posters are a significant form of communication in political campaigns. They are strategically placed to promote candidates and convince voters. However, viewers are not just passive receivers; they can also reciprocate and “jam” an election poster. This article offers an explorative approach to such practices to study their creation and usage. Two distinct examples of defacement are chosen and examined. Both of these reacted to the Social Democratic Party of Germany’s (SPD) election campaign for the German federal election in 2005. The election took place after widespread protests and a loss of confidence in the SPD and its chancellor. The investigated posters showed parallels to political culture jamming, though parody or disturbing effects are not true of all modifications. Election posters are also used as a medium to communicate politics from the grassroots. 相似文献
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Culture and Class Influences on Anglo and Puerto Rican Mothers' Beliefs Regarding Long-Term Socialization Goals and Child Behavior 总被引：2，自引：0，他引：2
Robin L. Harwood Axel Schoelmerich Elizabeth Ventura-Cook Pamela A. Schulze Stephanie P. Wilson 《Child development》1996,67(5):2446-2461
These 2 studies examine culture and socioeconomic status as simultaneous possible sources for group differences in mothers' beliefs regarding desirable and undesirable long-term socialization goals and child behavior. In Study 1, 100 mothers of young toddlers aged 12–24 months from 5 sociocultural groups participated: middle- and lower-class Anglo, middle- and lower-class island Puerto Rican, and lower-class migrant Puerto Rican. Results indicate that culture and socioeconomic status contribute independently to group differences, but that cultural effects appear to be stronger. Study 2 examined cultural differences in perceptions of behaviors using middle-class Anglo and Puerto Rican mothers only. The findings support those of Study 1, suggesting that Anglo and Puerto Rican mothers place differential value on the constructs of Self-Maximization and Proper Demeanor, even when socioeconomic status is controlled for. The findings of these studies have important implications for the culturally sensitive study of the relation between parental beliefs and behaviors. 相似文献
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In an attempt to exploit the concept of mindfulness for educational contexts, we investigated the role of dispositional mindfulness as an internal resource for the development of situational interest. Using an online questionnaire, we assessed participants’ (N?=?161, mean age?=?30.4 years, 74% female, 66% university students) mindfulness, presented them with a text on bionics, and asked them to indicate their situational interest regarding the material (t1). One week later, they indicated their maintained situational interest (t2). Findings reveal a positive relationship between mindfulness and situational interest at t1, especially with regard to participants’ ability to be momentarily ‘present’ and affective aspects of situational interest. Furthermore, we found an indirect effect of mindfulness on maintained situational interest at t2 via participants’ interest at t1. These findings were independent from participants’ initial interest and knowledge. Contrary to our expectation, we did not find a moderation effect for mindfulness on the relation between situational interest at t1 and t2. We discuss these findings in terms of implications for formal learning contexts. 相似文献
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George J. Sanders Lynne M. Boddy S. Andy Sparks Whitney B. Curry Brenda Roe Axel Kaehne 《Journal of sports sciences》2019,37(11):1270-1279
Wrist-based accelerometers are now common in assessing physical activity (PA) and sedentary behaviour (SB) in population-based studies, but there is a scarcity of raw acceleration cutpoints in older adults. The study aimed to determine and evaluate wrist-based GENEActiv (GA) and hip-based ActiGraph GT3X+ (AG) raw acceleration cutpoints for SB and moderate-to-vigorous PA (MVPA) in older adults ≥60 years of age. A laboratory-based calibration analyses of 34 healthy older adults involved receiver operator characteristic (ROC) curves to determine raw acceleration cutpoints for SB and MVPA. ROC analysis revealed an area under the curve (AUC) of 0.88 for GA SB and MVPA, and 0.90 for AG SB and 0.94 for AG MVPA. Sensitivity optimised SB and specificity optimised MVPA GA cutpoints of 57 mg and 104 mg, and AG cutpoints of 15 mg and 69 mg were also generated, respectively. Cross-validation analysis revealed moderate agreement for GA and AG SB cutpoints, and fair to substantial agreement for GA and AG MVPA cutpoints, respectively. The resultant cutpoints can classify older adults as engaging in SB or not engaging in MVPA but the sensitivity optimised SB cutpoints should be interpreted with a degree of caution due to their modest cross-validation results. 相似文献