How to calculate a measure of a total error in this clustering

Posted by Vafello on Stack Overflow See other posts from Stack Overflow or by Vafello
Published on 2010-05-01T18:20:41Z Indexed on 2010/05/01 18:27 UTC
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algorithm-design

I have the following points and clustering of data S1. Can anyone tell me how to calculate the total error associated with this clustering? I know it's not a strictly programming question, but I need it for my algorithm. I think the answer should be 4/3 but I have no idea how to calculate this. Can anyone help me?

x1= (2.0,1.0)
x2= (2.0,2.0)
x3= (1.0,2.0)

S1={ x1, x2, x3 }

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