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What is a training data and a testing data?

978268Dec 19 2012 — edited Dec 21 2012
When doing clustering, you work with testing data in order to evaluate the performance of your model. What does the testing data include? The training data is the one we work with, i.e. preparing the data, modeling, etc, correct?

I just need a clear difference between the two..
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Locked on Jan 18 2013
Added on Dec 19 2012
#11g, #data, #machine-learning, #table, #workflow
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