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Hello and welcome to this video where we will be taking a look at sensitivity and specificity. Well take a look at what they are, how they are calculated and two related measurements positive and negative predictive values. Tests are important tools that can help us identify the presence or absence of a disease. Butthey are not always perfect. Sensitivity and specificity are measures that can be used to determine how good a test is at correctly identifying the presence or absence of disease. Lets take a closer look. Lets use a table of the outcome of the test and disease status to learn about some of the terms that are used There are people with a disease and those without the disease When we do a test on someone, it can be either positive or negative. If the test is positive, it should mean that the person has the disease. This is called a true positive It correctly identifies a person with the disease Similarly, if a test is negative, it should mean t