dm3part4 - University of Florida CISE department...

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University of Florida CISE department Gator Engineering Classification Part 4 Dr. Sanjay Ranka Professor Computer and Information Science and Engineering University of Florida, Gainesville
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University of Florida CISE department Gator Engineering Data Mining Sanjay Ranka Spring 2011 Model Evaluation • Metrics for Performance Evaluation – How to evaluate the performance of a model • Methods for Performance Evaluation – How to obtain reliable estimates • Methods for Model Comparison – How to compare the relative performance among competing models
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University of Florida CISE department Gator Engineering Data Mining Sanjay Ranka Spring 2011 Metrics for Performance Evaluation • Focus on the predictive capability of a model – Rather than how fast it takes to classify or build models, scalability, etc. • Confusion Matrix: PREDICTED CLASS ACTUAL CLASS Class=Yes Class=No Class=Yes a b Class=No c d a: TP (true positive) b: FN (false negative) c: FP (false positive) d: TN (true negative)
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CISE department Gator Engineering Data Mining Sanjay Ranka Spring 2011 Metrics for Performance Evaluation • Most widely-used metric: PREDICTED CLASS ACTUAL CLASS Class=Yes Class=No Class=Yes a (TP) B (FN) Class=No c (FP) d (TN)
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dm3part4 - University of Florida CISE department...

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