Now we want to create a new test (Method A) to screen for a disease. In fact, there is a ‘gold-standard’ screening test for the disease (Method B). And the test result of gold-standard (Method B) is binary (Positive vs. Negative).
However, the test result of the new test (Method A) is 3-class classification (Positive vs. Negative vs. Doubtful).
Could we still calculate the sensitivity and specificity as being ways to indicate the accuracy of the new test (Method A)? (Table 1)
