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Racah Institute of Physics
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Department of Psychology
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Institute of Chemistry
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    ABSTRACT: The role of outcome feedback in collaborative learning settings has received little empirical attention. We examined whether outcome feedback improves learning gains in singleton and dyadic learning conditions, while specifying different dyadic pairing options. In a randomized experiment, 496 ninth-graders solved challenging tasks that required fully developed proportional reasoning to be solved correctly. Based on individual pretest performance, each student was assigned to one of three levels of proportional reasoning competence (Wrong1, Wrong2 and Right) and randomly assigned to either work alone or with a (Wrong1, Wrong2 and Right) peer. Half of the dyads and singletons were given the opportunity to empirically test their solutions and received outcome feedback from an objective testing device. The results indicated that when collaboration is considered as a general condition, learners in dyads and singletons profited equally from outcome feedback. When different dyadic compositions are specified, however, the combination of collaborating with a “Right” partner and receiving outcome feedback proved to be particularly powerful. Outcome feedback did not improve learning in any of the other conditions. Furthermore, and contrary to the “two-wrongs-make-a-right-effect”, interaction between two different “Wrong” students did not yield larger gains than other pairing options. The outcomes are discussed in light of existing theories and research.
    Learning and Instruction 12/2014; 34.
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    ABSTRACT: The average consensus in continuous-time multi-agent systems with dynamically changing topologies and multiple time-varying delays is studied in this paper. The network topology is captured by weighted digraphs which are weakly connected and balanced. Some feasible linear matrix inequalities are established to determine the allowable upper bounds of multiple delays that guarantee the average consensus of the system. Numerical examples are provided to show the usefulness of the theoretical results.
    Applied Mathematics and Computation 10/2014; 244:457–466.
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    ABSTRACT: Over the last 15 years, dramatically decreasing foreign investment costs have not reduced the home bias. We show that the home bias induced by a given cost is proportional to the factor ρ/(1 − ρ), where ρ is the average correlation between markets. This factor is very sensitive to the correlation, especially when the correlation is high. Empirically, correlations have been steadily increasing from 0.4 in the 90’s to about 0.9 today. Thus, the decreasing extra costs are increasingly magnified, explaining the persistence of the home bias, and predicting its continuation.
    Journal of Banking & Finance 10/2014; 47:29–40.


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    Jerusalem, Israel
  • Head of Institution
    Amir Steinman
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J.phys. chem. C. 03/2011;
Rehabilitation Counseling Bulletin 01/2007; 50:166-176.

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Rg score distribution

See how the RG Scores of researchers from Hebrew University of Jerusalem are distributed.