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Test Validation and Statistics
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Terms in this set (10)
sensitivity
The ability of a test to detect disease. The abnormal non invasive test result is confirmed or supported by an abnormal result of the gold standard.
number of true positives/ number of all positives diagnosed by the gold standard
How do you calculate sensitivity?
specificity
The ability of a test to identify normality. The normal test result is confirmed or supported by a normal gold standard result.
number of true negatives/ number of all negatives by gold standard
How do you calculate specificity?
positive predictive value
The percentage of noninvasive test results that accurately predict abnormality. Of the positive non invasive studies, what percentage correctly predicted disease as supported by the gold standard?
number of true positive noninvasive/ number of all positive noninvasive
How to calculate positive predictive value?
negative predictive value
The percentage of noninvasive test results that accurately predict normality. Of your negative noninvasive studies, what percentage correctly predicted the absence of disease?
number of true negative noninvasive tests/ number of all negative noninvasive tests
How to calculate negative predictive value?
accuracy
Percentage of correct noninvasive diagnoses. How well the noninvasive test predicts and rules out disease.
total number of correct/ total number of studies
How to predict accuracy?
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