Summary. A general method for exploring multivariate data by comparing different estimates of multivariate scatter is presented. The method is based on the eigenvalue–eigenvector decomposition of one scatter matrix relative to another. In particular, it is shown that the eigenvectors can be used to generate an affine invariant co-ordinate system for the multivariate data. Consequently, we view this method as a method for invariant co-ordinate selection . By plotting the data with respect to this new invariant co-ordinate system, various data structures can be revealed. For example, under certain independent components models, it is shown that the invariant co- ordinates correspond to the independent components. Another example pertains to mixtures of elliptical distributions. In this case, it is shown that a subset of the invariant co-ordinates corresponds to Fisher's linear discriminant subspace, even though the class identifications of the data points are unknown. Some illustrative examples are given. 相似文献
The paper seeks to makes a contribution to a recent debate in the Journal about what a political economy of youth might look like. The paper will take up aspects of Sukarieh and Tannock’s [2016. ‘On the political economy of youth: a comment.’ Journal of Youth Studies 19 (9): 1281–1289] response to the initial contributions by Côté [2014. ‘Towards a New Political Economy of Youth.’ Journal of Youth Studies 17 (4): 527–543, 2016. ‘A New Political Economy of Youth Reprised: Rejoinder to France and Threadgold.’ Journal of Youth Studies.] And France and Threadgold [2015. ‘Youth and Political Economy: Towards a Bourdieusian Approach.’ Journal of Youth Studies], and will take the form of three ‘notes’: Capitalism: From the first industrial revolution to the third industrial revolution; Youth as an artefact of governmentalised expertise; The agency/structure problem in youth studies: Foucault’s dispositif and post-human exceptionalism.
These notes will suggest that twenty-first century capitalism is globalising, is largely neo-Liberal, and is being reconfigured in profound ways by the Anthropocene, bio-genetics, Artificial Intelligence (AI), and the Internet of Things (IoT). A political economy of twenty-first century capitalism, let alone a political economy of young people, must be able to account for a capitalism that in many ways looks like the capitalism of the First and Second Industrial Revolutions, but which is at the same time profoundly different as it enters what has often been described as the Third Industrial Revolution. It is these profound emergences that pose the greatest challenges for engaging with a political economy of youth. 相似文献
This paper analyses the importance of evaluating the various components of the programmes or actions carried out by education organisations. It highlights the need to assess the impact of the intervention on the organisation and consider how changes are consolidated over time in interaction with the context. We propose an impact evaluation model and as an example have chosen the implementation of Quality Management Systems in schools. The paper analyses the results obtained in 40 schools in three regions (Spanish Autonomous Communities) with varying levels of implementation. The results show overall impact on these education centres as the teachers and management teams of the centres perceive it. This impact is more evident in some of the dimensions considered in the study than in others. The results also confirm the differences between regional contexts. 相似文献