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What is Accuracy?

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Accuracy is the most straight-forward evaluation metric for a classification problem, and it simply measures the overall proportion of observations that were correctly classified. The accuracy can be calculated from a confusion matrix by summing the diagonal cells (true positives and true negatives) and then dividing by the total number of observations. In general, accuracy is calculated by: 

Accuracy = (True Positives + True Negatives) / Total Observations

Using an example:

Confusion Matrix


Accuracy is = (100 + 150) /360 = .694

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