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K-Means Clustering (Material from cs412, uiuc) - The Lack Thereof

K-Means Clustering (Material from cs412, uiuc) - The Lack Thereof

K-Means Clustering (Material from cs412, uiuc) - The Lack Thereof

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<strong>The</strong> K-<strong>Means</strong> <strong>Clustering</strong> Method<br />

●<br />

Given k, the k-means algorithm is implemented in four<br />

steps:<br />

●<br />

●<br />

●<br />

●<br />

Partition objects into k nonempty subsets<br />

Compute seed points as the centroids of the clusters of<br />

the current partitioning (the centroid is the center, i.e.,<br />

mean point, of the cluster)<br />

Assign each object to the cluster with the nearest seed<br />

point<br />

Go back to Step 2, stop when the assignment does not<br />

change<br />

July 22, 2010 Data Mining: Concepts and Techniques 2

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