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The evaluation methods are explained in Table 1 as a confusion matrix. For example, DD represents the number that actual DEEPs classified as DEEP by the SVM while DL represents the number of actual DEEPs classified as LIGHT. Results of sleep stage estimation were evaluated based on sensitivity, specificity and accuracy for each stage, and the three indices were calculated for each subject and each stage.
Confusion matrix for evaluation
DALL, LALL, RALL, and WALL are defined as follows:
In the case of DEEP, sensitivity (Sens.) was calculated with Eq. (8), specificity (Spec.) with Eq. (9) and accuracy (Acc.) with Eq. (10).
Moreover, total accuracy was calculated with Eq. (11) and kappa static was calculated [19, 20].
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