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Marakas Chapter 1
Marakas Chapter 1

... There is no single data mining approach, but rather a set of techniques that can be used in combination with each other. ...
PPT
PPT

... Analysts are automating their work by building tools that read the news and try to predict the market situations for the next day. Sentiment Analysis is still one of the hottest applications (and yours truly has been engaged in research on Sentiment Analysis for two years.) You can read about Risk A ...
Using evolutionary algorithms as instance selection for data
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... • Each internal node contains at most B elements, each of the form [CFi, childi], childi is a pointer points to the ith child node. CFi is the CF of the cluster associated with ith child node. The CF of the internal node is the sum of all CFi of its children. • Each leaf node contains at most L entr ...
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Nonlinear dimensionality reduction



High-dimensional data, meaning data that requires more than two or three dimensions to represent, can be difficult to interpret. One approach to simplification is to assume that the data of interest lie on an embedded non-linear manifold within the higher-dimensional space. If the manifold is of low enough dimension, the data can be visualised in the low-dimensional space.Below is a summary of some of the important algorithms from the history of manifold learning and nonlinear dimensionality reduction (NLDR). Many of these non-linear dimensionality reduction methods are related to the linear methods listed below. Non-linear methods can be broadly classified into two groups: those that provide a mapping (either from the high-dimensional space to the low-dimensional embedding or vice versa), and those that just give a visualisation. In the context of machine learning, mapping methods may be viewed as a preliminary feature extraction step, after which pattern recognition algorithms are applied. Typically those that just give a visualisation are based on proximity data – that is, distance measurements.
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