Epoch-by-epoch sleep-wake performance evaluation equations.

<p>All of these equations rely on four basic classification parameters: True positive (TP), true negative (TN), false positive (FP), and false negative (FN). We denote 'sleep' as positive and 'wake' as negative. PPV and NPV stand for positive and negative predictive values, respectively. κ—the Cohen's kappa coefficient. <i>Pe</i>—probability of agreement by chance.