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Pattern classification - Brain Research Imaging Centre Edinburgh

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Accuracy & Dataset balance<br />

Watch out if #samples/class are different!<br />

Example:<br />

Good overall accuracy (72%) but<br />

•Majority class (N 1 = 80), excellent accuracy (90%)<br />

•Minority class (N 2 = 20), poor accuracy (0%)<br />

Good practice:<br />

Report<br />

•class accuracies [p 0 , p 1 , …, p C ]<br />

•balanced accuracy p bal = (p 0 + p 1 + …+ p C )/C

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