Pattern classification - Brain Research Imaging Centre Edinburgh
Pattern classification - Brain Research Imaging Centre Edinburgh
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