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Usage and meaning of specific technical words/concepts in statistics.
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Why is the clustering cost function called "distortion"?
Andrew Ng's excellent ML course on Coursera describes the k-means clustering algorithm and its cost function (roughly, the points' distance from their cluster centre), which he says is called "distort …
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Why is the clustering cost function called "distortion"?
Eureka! For a two-dimensional analogy, imagine a horizontal rubber sheet that is fixed at certain points representing the input samples. Get hold of the sheet at one of the cluster centroids and str …