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The role of secondary covariates when estimating latent trait population distributions 总被引:1,自引:0,他引:1
Neal Thomas 《Psychometrika》2002,67(1):33-48
The U.S. National Assessment of Educational Progress (NAEP), the Third International Mathematics and Science Study (TIMSS), and the U.S. Adult Literacy Survey collect probability samples of students (or adults) who are administered brief examinations in subject areas such as mathematics and reading (cognitive variables), along with background demographic (primary) and educational environment (secondary) questions. The demographic questions are used in the primary reporting, while the numerous explanatory secondary variables, or covariates, are only directly utilized in subsequent secondary analyses. The covariates are also used indirectly to create the plausible values (multiple imputations) that are an integral part of analyses because of the use of sparse matrix sampling of cognitive items. The improvement in the precision of the primary reporting due to the inclusion of the covariates is assessed here and contrasted with the precision of reporting using plausible values created using only the primary demographic variables.The results demonstrate that the improvement in precision depends on the matrix sampling designs for the cognitive assessments. The improvements range from essentially none for the most common designs, to moderate for some less common designs. Consequently, two potential changes in the reporting procedures that could improve the statistical and operational efficiency of primary reporting are (a) eliminate or reduce the collection of covariates and increase the number of cognitive items, (b) to avoid delays, eliminate the covariates from the creation of plausible values used for the primary reports, but include them later when creating public-use files for secondary analyses. The potential improvements in statistical and operational efficiency must be weighed against the intrinsic interest in the covariates, and the potential for small discrepancies in the primary and secondary reporting.Thanks to Donald Rubin, Robert Mislevy, and John Barnard for their helpful comments and computing assistance. This work was supported by NCES Grant 84.902B980011. 相似文献
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Tracy Vaillancourt 《Aggressive behavior》2013,39(1):71-84
Laboratory evidence about whether students’ evaluations of teaching (SETs) are valid is lacking. Results from three (3) independent studies strongly confirm that "professors" who were generous with their grades were rewarded for their favor with higher SETs, while professors who were frugal were punished with lower SETs (Study 1, d = 1.51; Study 2, d = 1.59; Study 3, partial η2 = .26). This result was found even when the feedback was manipulated to be more or less insulting (Study 3). Consistent with laboratory findings on direct aggression, results also indicated that, when participants were given a poorer feedback, higher self‐esteem (Study 1 and Study 2) and higher narcissism (Study 1) were associated with them giving lower (more aggressive) evaluations of the "professor." Moreover, consistent with findings on self‐serving biases, participants higher in self‐esteem who were in the positive grade/feedback condition exhibited a self‐enhancing bias by giving their "professor" higher evaluations (Study 1 and Study 2). The aforementioned relationships were not moderated by the professor's sex or rank (teaching assistant vs.professor). Results provide evidence that (1) students do aggress against professors through poor teaching evaluations, (2) threatened egotism among individuals with high self‐esteem is associated with more aggression, especially when coupled with high narcissism, and (3) self‐enhancing biases are robust among those with high self‐esteem. Aggr. Behav. 39:71‐84, 2013. © 2012 Wiley Periodicals, Inc. 相似文献
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In a longitudinal natural language development study in Germany, the acquisition of verbal symbols for present persons, absent persons, inanimate things and the mother–toddler dyad was investigated. Following the notion that verbal referent use is more developed in ostensive contexts, symbolic play situations were coded for verbal person reference by means of noun and pronoun use. Depending on attachment classifications at twelve months of age, effects of attachment classification and maternal language input were studied up to 36 months in four time points. Hierarchical regression analyses revealed that, except for mother absence, maternal verbal referent input rates at 17 and 36 months were stronger predictors for all referent types than any of the attachment organizations, or any other social or biological predictor variable. Attachment effects accounted for up to 9.8% of unique variance proportions in the person reference variables. Perinatal and familial measures predicted person references dependent on reference type. The results of this investigation indicate that mother-reference, self-reference and thing-reference develop in similar quantities measured from the 17-month time point, but are dependent of attachment quality. 相似文献
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Claudia Castañeda 《Science as culture》2013,22(3):375-409
In recent years, public science events have been designed as a means to foster a dialogue between science and the public and to contribute to ongoing policy processes. Regardless of their tangible outcome, such events rely on a certain framing, reconfigure scientific knowledge and conceptualise the public in specific ways. These constructs are exemplified by a science festival that was held in the train station hall in Zurich. Novel insights can be gained from a spatial, an object and an actor-related approach borrowed from the artistic context: the discussions about the White Cube can be adapted to contribute to the analysis of the science festival. When we look into the spatial situation created to foster exchange about scientific knowledge, we find how the exhibition display is taking care of minor details. While the organisers transformed the station hall into a laboratory, they created a kind of dialogic situation that filled an authority gap as it equally enabled exchange. The objects put in place in the exemplary case helped to design a customer–supplier relationship between the public and science. Under the umbrella of the science event, a range of diverse research endeavours was homogenised and unified. The audience, finally, was invited to familiarise itself with scientific knowledge. However, they were allocated a consumer role that obliged them to remain guests in the laboratory environment of the station hall. Thus, public science events may be successful in attracting large attendance and allowing more experiences with science, but while they create novel forms of familiarisation with science for visitors, they do not necessarily remedy public doubts about science and technology. 相似文献
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Gordon Rowland 《World Futures: Journal of General Evolution》2013,69(3-4):367-381
Growing appreciation of work done in the past several decades in complexity science is changing how we see the world. Efforts to apply what has been learned there to human systems such as organizations, perhaps through metaphor, challenges our views of social structures and how we may influence their organization and functioning. This article considers the implications of some key propositions from chaos theory for the design of social systems. 相似文献
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Per Anderson 《Theology & Science》2013,11(2):171-173
The Battle of Dover is now concluded; and Charles Darwin's theory of evolution has won the legal day. The Theory of Evolution in the Darwainian and neo-Darwinian form is a very fertile theory; it generates hypotheses and research programs that lead to new knowledge. Even as a secular pursuit of knowledge, Christians appreciate science. What the Christian community cannot tolerate is second-rate science; and it especially eschews pseudo-science. We ask for a general commitment; support the best science in our schools and laboratories as an expression of our Christian faith. In light of the public controversy regarding alternatives to teaching Darwinian science in our public schools, we offer six recommendations. 相似文献