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Overview :
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))
where:
• 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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Braunwald E,
Isselbacher KJ, et al (editors). Harrison's
Principles of Internal Medicine, 11th edition. McGraw-Hill Book Publishers.
1987. page 7
Goldman L.
Chapter 10: Quantitative aspects of clinical reasoning. pages 43-48. IN:
Isselbacher KJ, Braunwald E, et al. Harrison's
Principles of Internal Medicine, Thirteenth Edition. McGraw-Hill. 1994.
Clave P,
Guillaumes S, Blanco I, et al. Amylase, Lipase, Pancreatic Isoamylase, and
Phospholipase A in Diagnosis of Acute Pancreatitis. Clin Chem. 1995;
41:1129-1134. <with ROC>
Speicher C,
Smith JW Jr.. Choosing Effective Laboratory Tests. WB Saunders. 1983. pages
50-51, and 210
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