Data-mining is about probabilities, not certainties. So sometimes a good model may look bad because of a string of bad luck.

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Data-mining involves analyzing large amounts of data to find patterns and make predictions. However, these predictions are not always 100% accurate as they are based on probabilities. Sometimes, even a good model can provide inaccurate results due to chance or unexpected events.

Data-Mining Is About Probabilities, Not Certainties