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The observed sensitivity of Test 2 for the series design, however, falls below the true sensitivity.
As a result, the observed sensitivity of Test 2 in the series design drops below the true sensitivity and the percent bias goes from positive to negative.
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Secondly, sample size is large enough to ensure that the true sensitivity and specificity with 95% confidence do not fall below 80%.
The true ROC curve is generated by plotting the true sensitivity on the vertical axis versus one minus the true specificity on the horizontal axis.
We then calculate the true sensitivity for each test as the number of true positives identified by that screening test divided by the total number of true cases.
The true camera sensitivity calibration factor, cf true, gives the SPECT camera sensitivity (cps/MBq) when no partial volume effects are present.
For Test 2, the observed sensitivity is 0.52, with true sensitivity of 0.43.
The increase in observed sensitivity compared to true sensitivity is expected with verification bias [ 9].
Listed below are the true foxes of the genus Vulpes.
The receiver-operating characteristic (ROC) is a graphical representation of the true positive rate (sensitivity) v/s false positive rate (1-sensitivity).
They provide estimates of the true positive rate (sensitivity) and true negative rate (specificity) of a test [ 13].
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