8) Diagnostic Test Flashcards Preview

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Flashcards in 8) Diagnostic Test Deck (9)
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1
Q

Sensitivity

A
  • proportion of people with disease who test positive
2
Q

Specificity

A

Proportion of people with no disease who test negative

3
Q

Positive predictive value:

A

Proportion of people who test positive and have the disease

4
Q

Negative predictive value

A

Proportion of people who test negative that have no disease

5
Q

Spin Snout

A
  • when a test has a high sensitivity, a negative test rules out a disease
  • when a test has high specificity, a positive test rules in the disease
6
Q

Evaluating diagnostic test

A

typically cross sectional studies

7
Q

Verificatiion bias

A
  • occurs when only a proportion of people with negative index test results has the reference standard done
8
Q

Validation

A

The index test is a new test and the diagnostic threshold has been determined only when using this data set
- the index test is a prediction based on a large number of parameters and the test accuracy has been determined using this training set only

9
Q

What is Random Error?

A

Poo