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Machine learning algorithms build a model of the training data. The term "machine learning" is vaguely defined; it includes what is also called statistical learning, reinforcement learning, unsupervised learning, etc. ALWAYS ADD A MORE SPECIFIC TAG.

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How to know if my data is balanced or imbalanced for an ROC curve analysis?

I am doing a research on the reliability of different models in detecting hidden defects in a test specimen. I have made a test specimen with defect prevalence about 25% (12 positive out of 49 total p …