Past exam of the mathematics course of the University of Cambridge / 2021 / iii / Paper 207 / 1 / b / i / Solution

Because the measurement can cross the threshold in both directions while the model declares dementia irreversible, one needs the diagnostic rule's sensitivityand specificityThese quantify false negative and false positive state classifications and permit a hidden-state or misclassification model instead of treating every threshold crossing as the true irreversible onset.