Christopher Claassen

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This paper uses a Bayesian hierarchical latent trait model, and data from eight different university ranking systems, to measure university quality. There are five contributions. First, I find that ratings tap a unidimensional, underlying trait of university quality. Second, by combining information from different systems, I obtain more accurate ratings(More)
Paracrine influences from fibroblasts derived from different sources of breast tissue on epithelial breast cancer cell growth in vitro were investigated. Medium conditioned (CM) by fibroblasts derived from tumours, adjacent normal breast tissue, and normal breast tissue obtained from reduction mammoplasty or from skin tissue significantly stimulated the(More)
This article presents an electoral model where activist groups contribute resources to their favored parties. These resources are then used by the party candidates to enhance the electoral perception of their quality or valence. We construct an empirical model of the United States presidential election of 2008 and employ the electoral perception of the(More)
Researchers frequently claim that personality traits, measured using the Ten Item Personality Inventory (TIPI) battery, affect Americans’ political attitudes and behaviors. Such studies often depend on two key assumptions: personality measurements display stability over time and predate political behaviors of interest. In this paper we employ new panel(More)
Previous empirical research has developed stochastic electoral models for Israel, Turkey, and other polities. The work suggests that convergence to an electoral center often predicted by electoral models is a nongeneric phenomenon. In an attempt to explain nonconvergence, a formal model based on intrinsic valence is presented. This theory showed that there(More)
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