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Olivier Cappé Randal Douc Arnaud Guillin Jean-Michel Marin Christian P. Robert 《Statistics and Computing》2008,18(4):447-459
In this paper, we propose an adaptive algorithm that iteratively updates both the weights and component parameters of a mixture
importance sampling density so as to optimise the performance of importance sampling, as measured by an entropy criterion.
The method, called M-PMC, is shown to be applicable to a wide class of importance sampling densities, which includes in particular
mixtures of multivariate Student t distributions. The performance of the proposed scheme is studied on both artificial and real examples, highlighting in particular
the benefit of a novel Rao-Blackwellisation device which can be easily incorporated in the updating scheme.
This work has been supported by the Agence Nationale de la Recherche (ANR) through the 2006–2008 project
’
. Both last authors are grateful to the participants to the BIRS
meeting on “Bioinformatics, Genetics and Stochastic Computation: Bridging the Gap”, Banff, for their comments on an earlier
version of this paper. The last author also acknowledges an helpful discussion with Geoff McLachlan. The authors wish to thank
both referees for their encouraging comments. 相似文献
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Regarding the effect of product variety on purchase probability, there exist findings which demonstrate a positive effect
of variety for small assortments and a negative effect of variety for large assortments. Despite these results, little evidence
exists about the causal mechanism of this effect. We conduct a field study among German consumer electronics customers to
investigate the previously proposed constructs of anticipated product utility, anticipated regret and evaluation costs. The
results suggest that anticipated regret and evaluation costs play a powerful role in explaining the negative link between
variety and purchase probability for high variety assortments. Anticipated product utility on the other hand serves to explain
part of the positive causality for low variety assortments. The results obtained give rise to recommendations for the planning
of assortments.
相似文献
Andreas HerrmannEmail: |
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Objectives: Male sex work (i.e., escorting) is a stigmatized profession, and men in the sex industry may hide their involvement to avoid negative social consequences. There is limited research comparing men who are out about being an escort to their friends and/or family to those who are out to neither friends nor family. Methods: Data were taken from a 2013 online study of male escorts who were categorized into 3 groups based on outness patterns — friends only (48.9%, n = 193), friends and family (26.6%, n = 105), or neither friends nor family (23.5%, n = 93) — and they were compared on demographic and behavioral variables. Results: We hypothesized that men out to neither friends nor family would perform poorer across indicators of health and well-being due to the lack of social support that can come from friends and family. However, with the exception of reporting lower satisfaction and pay from their last male client, this hypothesis was unsupported. Outness patterns were largely unassociated with social and sexual behaviors with the last male client, and the majority eschewed condomless anal sex with their last male client, suggesting escorts — regardless of how out they are to friends and family — could navigate safer-sex behaviors with their clients. Outness was associated with substance use (<12 months) and substance use with their last male client — men out to friends and family were, for the most part, the most likely to have used substances. Men out to friends and family were significantly more likely than others to have been escorting for more than 5 years and to be escorting full-time. Conclusions: Interventions for escorts that address substance use and sexual risk behaviors and incorporate supportive friend and family social networks may be an important area for future research. 相似文献
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Methodological troubles as problems and phenomena: ethnomethodology and the question of ‘method’ in the social sciences
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Christian Greiffenhagen Michael Mair Wes Sharrock 《The British journal of sociology》2015,66(3):460-485
Across the disciplinary frontiers of the social sciences, studies by social scientists treating their own investigative practices as sites of empirical inquiry have proliferated. Most of these studies have been retrospective, historical, after‐the‐fact reconstructions of social scientific studies mixing interview data with the (predominantly textual) traces that investigations leave behind. Observational studies of in situ work in social science research are, however, relatively scarce. Ethnomethodology was an early and prominent attempt to treat social science methodology as a topic for sociological investigations and, in this paper, we draw out what we see as its distinctive contribution: namely, a focus on troubles as features of the in situ, practical accomplishment of method, in particular, the way that research outcomes are shaped by the local practices of investigators in response to the troubles they encounter along the way. Based on two case studies, we distinguish methodological troubles as problems and methodological troubles as phenomena to be studied, and suggest the latter orientation provides an alternate starting point for addressing social scientists' investigative practices. 相似文献