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how was the parameters calculated

Hi
I would like to know exactly how the index SumOfSquares of Itemdistributionevaluator operator is calculated?
and
I would like to know exactly how the index Classification error of Classificationperformance operator is calculated?
and please to detail mean of the parameters

example: Sumofsquares = 0.564
Classification error = 7.5% -/+ 10%
what's this mean?

Best regard

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el_chief

read the source code?

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