The overall accuracy of a test is the measure of "true" findings (true-positive + true-negative results) divided by all test results. This is also termed "the efficiency" of the test.
overall accuracy =
= ((a+d) / (a + b + c + d))
• a + d = true positives + true negatives = all people correctly classified by testing
• (a + b + c + d) = sum of (true positives, false positives, false negatives, true negatives) = total population
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