38,079 research outputs found

    'Babylonian flats' in victorian and edwardian London

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    The first half of this paper examines the controversy associated with the building of Queen Anne's Mansions, London's first high-rise flats, erected between 1873 and 1890, and a catalyst for the introduction of height restrictions in the London Building Acts of 1890 and 1894. Subsequent sections consider the building's place in the imagination of Londoners, the marketing of the mansions, which emphasised their height and novelty, and the characteristics of residents, especially as recorded in the 1901 census. The paper concludes by positioning Queen Anne's Mansions in wider debates about living in flats and the acceptability of high-rise buildings in nineteenth-and early twentieth-century London. © The London Journal Trust 2008

    Puppet Leadership: An Essay in honor of Gabor Hegyesi

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    Abstract not available. Working Paper 08-0

    Fisher Lecture: Dimension Reduction in Regression

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    Beginning with a discussion of R. A. Fisher's early written remarks that relate to dimension reduction, this article revisits principal components as a reductive method in regression, develops several model-based extensions and ends with descriptions of general approaches to model-based and model-free dimension reduction in regression. It is argued that the role for principal components and related methodology may be broader than previously seen and that the common practice of conditioning on observed values of the predictors may unnecessarily limit the choice of regression methodology.Comment: This paper commented in: [arXiv:0708.3776], [arXiv:0708.3777], [arXiv:0708.3779]. Rejoinder in [arXiv:0708.3781]. Published at http://dx.doi.org/10.1214/088342306000000682 in the Statistical Science (http://www.imstat.org/sts/) by the Institute of Mathematical Statistics (http://www.imstat.org

    Mission-Market Tension in Managing Nonprofit Organizations

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    Private not-for-profit organizations combine characteristics of a public sector agency with those of a private, proprietary firm. In particular, nonprofits are required to address designated social missions while breaking even financially. This structure underlies the difficulty that nonprofit organizations face in making decisions with important resource implications. Specifically, choices that would achieve maximal mission impact may differ from choices that reward the organization in purely financial terms. As result, nonprofit managers face a variety of trade-offs between mission responsive and financially rewarding actions. This paper considers some of these tradeoffs by exploring how tensions between mission and market manifest themselves in a variety of nonprofit decision making applications. The analysis is based on a set of task forces assembled by the National Center on Nonprofit Enterprise in eight areas of nonprofit decision making. The paper suggests the development of metrics to reconcile mission goals with market incentives and research on appropriate nonprofit practices in areas such as pricing, employee compensation, outsourcing, collaboration, investment, fund raising and the undertaking of commercial ventures. Working Paper 06-2

    Testing predictor contributions in sufficient dimension reduction

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    We develop tests of the hypothesis of no effect for selected predictors in regression, without assuming a model for the conditional distribution of the response given the predictors. Predictor effects need not be limited to the mean function and smoothing is not required. The general approach is based on sufficient dimension reduction, the idea being to replace the predictor vector with a lower-dimensional version without loss of information on the regression. Methodology using sliced inverse regression is developed in detail

    Spiral vane bioreactor

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    A spiral vane bioreactor of a perfusion type is described in which a vertical chamber, intended for use in a microgravity condition, has a central rotating filter assembly and has flexible membranes disposed to rotate annularly about the filter assembly. The flexible members have end portions disposed angularly with respect to one another. A fluid replenishment medium is input from a closed loop liquid system to a completely liquid filled chamber containing microcarrier beads, cells and a fluid medium. Output of spent medium is to the closed loop. In the closed loop, the output and input parameters are sensed by sensors. A manifold permits recharging of the nutrients and pH adjustment. Oxygen is supplied and carbon dioxide and bubbles are removed and the system is monitored and controlled by a microprocessor

    Rejoinder: Fisher Lecture: Dimension Reduction in Regression

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    Rejoinder: Fisher Lecture: Dimension Reduction in Regression [arXiv:0708.3774]Comment: Published at http://dx.doi.org/10.1214/088342307000000078 in the Statistical Science (http://www.imstat.org/sts/) by the Institute of Mathematical Statistics (http://www.imstat.org

    3D product authenticity model for online retail: An invariance analysis

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    This study investigates the effects of different levels of invariance analysis on three dimensional (3D) product authenticity model (3DPAM) constructs in the e- retailing context. A hypothetical retailer Web site presents a variety of laptops using 3D product visualisations. The proposed conceptual model achieves acceptable fit and the hypothesised paths are all valid. We empirically investigate the invariance across the subgroups to validate the results of our 3DPAM. We concluded that the 3D product authenticity model construct was invariant for our sample across different gender, level of education and study backgrounds. These findings suggested that all our subgroups conceptualised the 3DPAM similarly. Also the results show some non-invariance results for the structural and latent mean models. The gender group posits a non-invariance latent mean model. Study backgrounds group reveals a non-invariance result for the structural model. These findings allowed us to understand the 3DPAMs validity in the e-retail context. Managerial implications are explained
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