Identify the key effect of low prevalence on PPV when sensitivity and specificity are fixed.
QUESTION
What is prevalence in diagnostic reasoning, expressed as a probability?
QUESTION
What is the false positive rate in terms of specificity?
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ANSWER
P(T+∣¬D)=1−specificity. False positive rate is the complement of specificity, representing the probability of a positive test result in the absence of the disorder.