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Rafael Pérez-Ocón Juan Eloy Ruiz-Castro & M. Luz Gámiz-Pérez 《Journal of the Royal Statistical Society. Series C, Applied statistics》2001,50(1):111-124
A cohort of 300 women with breast cancer who were submitted for surgery is analysed by using a non-homogeneous Markov process. Three states are onsidered: no relapse, relapse and death. As relapse times change over time, we have extended previous approaches for a time homogeneous model to a non omogeneous multistate process. The trends of the hazard rate functions of transitions between states increase and then decrease, showing that a changepoint can be considered. Piecewise Weibull distributions are introduced as transition intensity functions. Covariates corresponding to treatments are incorporated in the model multiplicatively via these functions. The likelihood function is built for a general model with k changepoints and applied to the data set, the parameters are estimated and life-table and transition probabilities for treatments in different periods of time are given. The survival probability functions for different treatments are plotted and compared with the corresponding function for the homogeneous model. The survival functions for the various cohorts submitted for treatment are fitted to the mpirical survival functions. 相似文献
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Muñetón-Santa Guberney Escobar-Grisales Daniel López-Pabón Felipe Orlando Pérez-Toro Paula Andrea Orozco-Arroyave Juan Rafael 《Social indicators research》2022,162(3):1413-1435
Social Indicators Research - This work introduces a methodology to classify between poor and extremely poor people through Natural Language Processing. The approach serves as a baseline to... 相似文献
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Rafael Ziegler 《Innovation: The European Journal of Social Science Research》2017,30(4):388-405
The rise of social innovation expresses a discontent with innovation as we know it, and its ability to deliver just and sustainable outcomes. Yet, social innovation is also notoriously vague as a concept, thereby putting into doubt whether the concept offers any real improvements or alternatives. This paper issues an invitation to think about social innovation as a collaborative concept. The conceptual framework shows collaboration, rather than contestation, to offer a space for the working together of different perspectives and actors. The collaborative concept frame welcomes and seeks to explain a diversity of uses. Singling out key features of social innovation as a collaborative concept, it seeks to contribute to an emerging practice that makes different contributions part of a progressive conversation about social innovation, the evaluative ideas associated with it and the evidence from policies and projects. Identifying transformative, taxonomical and transitional–sceptical uses of social innovation, the paper highlights the importance of analysing the evaluative aspects of the multisectoral reconfigurations associated with social innovation so as to keep track of its role for justice and sustainability. 相似文献
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Rafael Muñoz de Bustillo José-Ignacio Antón 《Population research and policy review》2011,30(5):661-676
This article for first time explores the relationship between immigration and poverty in Spain. Using recent Spanish household
surveys, it is found, first, that both moderate and severe poverty are more acute among immigrants than among nationals and
social transfers play no substantial role in reducing monetary deprivation in the case of foreign-born population; in the
second place, we perform an econometric analysis that shows that the different poverty risk faced by local and immigrant households
is not driven by differences in basic household and demographic characteristics. 相似文献
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We adopt a relational approach to examine the effects of social relations and formal structure on who speaks up to whom about problems at work. Data were collected in a two-wave employee survey in three Dutch preschools. Using exponential random graph modeling, we found significant positive effects of formal structure (recipient's hierarchical level; team co-membership) and good relations between speaker and recipient on the likelihood of voice in a dyad. Speaker's hierarchical level had positive effects, significant in Wave 1. Speaker's degree centrality significantly reduced the likelihood of voice, whereas recipient's degree centrality had no effect. 相似文献
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Consideration of reference systems for semivalues leads us to a global representation of the action of a semivalue on a game. Using this representation, we show how to modify semivalues to take account of coalition structures on the player set. The players' allocations according to a semivalue, including a modified semivalue, can be computed by means of products of matrices obtained from the multilinear extension of the game. 相似文献