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Accuracy assessment methods and current challenges

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Type II error<br />

H o is incorrectly accepted (fail to detect a meaningful<br />

difference that does exist).<br />

Probability of making a Type II error is β <strong>and</strong> related<br />

to the power of the test (1- β).<br />

Type I errors typically viewed x4 more important<br />

than Type II, so commonly, β = 0.2<br />

or (1- β) = 0.8

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