How about using the PCA to analyze changes in learning styles?
ICWL'12 Proceedings of the 11th international conference on Advances in Web-Based Learning
International Journal of Digital Literacy and Digital Competence
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In this paper we extend our previous bi-dimensional model of the experience - integrating experience styles and process characteristics - to account also for the peculiarities of the place. To each voxel of the resulting 3D space of representation can be associated a time dependent density that accounts for the relevance of such voxel at any time one takes a snapshot of the 3D space. Extrinsic and intrinsic forces (density gradients) are needed to make the system evolve from the initial state to a given final state (i.e. to origin the dynamics of educational processes).