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performance analysis of clustering algorithms in data mining in weka
performance analysis of clustering algorithms in data mining in weka

... ensures an easy and simple way to cluster the data objects in N number of clusters (specified by the user). The principal concept of this clustering technique is to designate N clusters to each k data objects. The position of these centroids is very important, since the result may vary if the locati ...
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clustering sentence level text using a hierarchical fuzzy
clustering sentence level text using a hierarchical fuzzy

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DEMON: Mining and Monitoring Evolving Data
DEMON: Mining and Monitoring Evolving Data

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Hierarchical Clustering with Simple Matching and Joint Entropy
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IOSR Journal of Computer Engineering (IOSR-JCE) e-ISSN: 2278-0661,p-ISSN: 2278-8727 PP 11-15 www.iosrjournals.org
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An Internet Protocol Address Clustering Algorithm
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Distance Based Clustering Algorithm

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Lecture 2: VIS - information visualization and data mining

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K-means clustering

k-means clustering is a method of vector quantization, originally from signal processing, that is popular for cluster analysis in data mining. k-means clustering aims to partition n observations into k clusters in which each observation belongs to the cluster with the nearest mean, serving as a prototype of the cluster. This results in a partitioning of the data space into Voronoi cells.The problem is computationally difficult (NP-hard); however, there are efficient heuristic algorithms that are commonly employed and converge quickly to a local optimum. These are usually similar to the expectation-maximization algorithm for mixtures of Gaussian distributions via an iterative refinement approach employed by both algorithms. Additionally, they both use cluster centers to model the data; however, k-means clustering tends to find clusters of comparable spatial extent, while the expectation-maximization mechanism allows clusters to have different shapes.The algorithm has a loose relationship to the k-nearest neighbor classifier, a popular machine learning technique for classification that is often confused with k-means because of the k in the name. One can apply the 1-nearest neighbor classifier on the cluster centers obtained by k-means to classify new data into the existing clusters. This is known as nearest centroid classifier or Rocchio algorithm.
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