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Lutz Bornmann Rüdiger Mutz Sven E. Hug Hans-Dieter Daniel 《Journal of Informetrics》2011,5(3):346-359
This paper presents the first meta-analysis of studies that computed correlations between the h index and variants of the h index (such as the g index; in total 37 different variants) that have been proposed and discussed in the literature. A high correlation between the h index and its variants would indicate that the h index variants hardly provide added information to the h index. This meta-analysis included 135 correlation coefficients from 32 studies. The studies were based on a total sample size of N = 9005; on average, each study had a sample size of n = 257. The results of a three-level cross-classified mixed-effects meta-analysis show a high correlation between the h index and its variants: Depending on the model, the mean correlation coefficient varies between .8 and .9. This means that there is redundancy between most of the h index variants and the h index. There is a statistically significant study-to-study variation of the correlation coefficients in the information they yield. The lowest correlation coefficients with the h index are found for the h index variants MII and m index. Hence, these h index variants make a non-redundant contribution to the h index. 相似文献
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Against the background of the long-debated, controversial issue of mixed-sex vs. single-sex education, this paper empirically analyses whether or not female students are put at a disadvantage by coeducational physical education (P.E.) classes. Drawn on the existing literature on school sport, it is assumed that coeducational P.E. classes, at least as currently practiced, rather conform to the sports-related expectations of boys than of girls. Based on the SPRINT data-set, it is investigated whether coeducation in P.E. is accompanied by more negative affective states, more negative self-ratings of athletic competence as well as poorer grades among female students. Girls in single-sex P.E. classes serve as a control group in these analyses. The findings confirm all of our hypotheses: Girls in coeducational P.E. classes (a) experience more negative affects prior to school sport, (b) have a more negative self-concept of their athletic abilities and (c) achieve significantly lower grades. In P.E., coeducation thus signifies measurable disadvantages for female students. In light of future challenges, like increasing diversity among students and the rising demand for inclusive education, these findings once more gain in importance. 相似文献
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The journal impact factor (JIF) proposed by Garfield in the year 1955 is one of the most prominent and common measures of the prestige, position, and importance of a scientific journal. The JIF may profit from its comprehensibility, robustness, methodological reproducibility, simplicity, and rapid availability, but it is at the expense of serious technical and methodological flaws. The paper discusses two core problems with the JIF: first, citations of documents are generally not normally distributed, and, furthermore, the distribution is affected by outliers, which has serious consequences for the use of the mean value in the JIF calculation. Second, the JIF is affected by bias factors that have nothing to do with the prestige or quality of a journal (e.g., document type). For solving these two problems, we suggest using McCall's area transformation and the Rubin Causal Model. Citation data for documents of all journals in the ISI Subject Category “Psychology, Mathematical” (Journal Citation Report) are used to illustrate the proposal. 相似文献
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Latent Markov modeling applied to grant peer review 总被引：1，自引：0，他引：1
In the grant peer review process we can distinguish various evaluation stages in which assessors judge applications on a rating scale. Research on the grant peer review process that considers its multi-stage character scarcely exists. In this study we analyze 1954 applications for doctoral and post-doctoral fellowships from the Boehringer Ingelheim Fonds (B.I.F.), which are evaluated in three stages (first: evaluation by an external reviewer; second: internal evaluation by a staff member; third: final decision by the B.I.F. Board of Trustees). The results of a latent Markov model (in combination with latent class analysis) show that a fellowship application has a chance of approval only if it is recommended for support already in the first evaluation stage, that is, if the external reviewer's evaluation is positive. Based on these results, a form of triage or pre-screening of applications seems desirable. 相似文献
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Voluntary work is regarded as a learning environment which facilitates character development and skills acquisition in adolescents. Based on a sample of young adults who completed a year of voluntary work in the social sector, this study investigates whether a volunteer service is accompanied by personality development, networking opportunities as well as amplified cognitive, social, and personal competencies. It is further investigated to what extent the potential for learning and personality development is shaped by the field of activity in which subjects are involved. To this end, this study analyzes retrospective self-ratings of volunteers. The findings indicate that voluntary work is linked to a variety of positively evaluated developmental changes regarding personality and skills. Moreover, the results reveal pronounced differences between different fields of activity. Four domains within the non-profit sector are described and analyzed, with each domain relating to a distinct horizon of experience and unique learning opportunity. These four domains are care and ministration, ambulance and rescue service, education and culture, and sport and exercise. 相似文献
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Diana C. Mutz 《Mass Communication and Society》2013,16(2):196-217
This study examined reactions to a temporary parasocial breakup situation during the television writers’ strike of 2007–2008 when many television shows stopped airing new episodes. Past research on parasocial breakups and uses and gratifications theory was used to predict emotional and behavioral reactions. Questionnaire results revealed that participants with stronger parasocial relationships experienced greater distress—even after controlling for the number of favorite programs that went off the air. Moreover, those with greater television affinity reported greater distress when their favorite show was disrupted, although television viewing motives also played a role in this process. Finally, when their favorite shows were no longer airing new episodes, viewers primarily replaced television viewing time with other media exposure rather than increasing nonmedia activities such as social interaction. However, a number of these activities varied by gender. 相似文献
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This paper explores the role of perceptions of the opinionsof others as they relate to the formation of public opinion.Two interrelated theories involving such perceptions, the thirdperson effect and the spiral of silence, are tested in the contextof public opinion regarding divestment of financial interestsin South Africa. As hypothesized by the third person effect, perceptions of theinfluence of media reports on others were found to be consistentlygreater than perceptions of influence on self. Findings werestrongly supportive of this component of the ‘third personeffect’ hypothesis. Perceptions of the opinions of otherswere also explored in relation to respondents' willingness toexpress their opinions publicly. As suggested by the spiralof silence theory, respondents were found to be more willingto express their opinions publicly when they perceived a trendin support of their viewpoint, or when there was a greater perceivedlikelihood of achieving success for their issue position. The size of the effect produced from joining these two processesis moderated by the role of issue salience. People perceivingdivestment as a highly important issue are more likely to ascribegreater media influence to others than to themselves, but theirwillingness to express their opinions publicly is least likelyto be influenced by perceptions of the climate of opinion. 相似文献