Lecture 6 8/29/24

Question 1

What is precision/reliability?

Answer 1

-ability of diagnostic equipment to give similar responses independent of who/when it was performed
-measure of agreement among repeated observations
-lack of random error

Question 2

What is validity/accuracy?

Answer 2

-ability of the test to correctly measure the true value
-degree of agreement between observed value and true value
-lack of systematic error

Question 3

What is usefulness?

Answer 3

every diagnostic test result should influence medical decision making

Question 4

What is value?

Answer 4

every diagnostic test should be humane, relatively easy, and inexpensive

Question 5

What is the desired relationship between the gold standard test and the index test?

Answer 5

want index test to match the gold standard as closely as possible in regards to results

Question 6

What is sensitivity?

Answer 6

probability of a test to correctly identify those animals that are diseased

Question 7

What is specificity?

Answer 7

ability of a test to correctly identify those animals that are not diseased

Question 8

What is the calculation for sensitivity?

Answer 8

percent proportion of subjects that tested positive among individuals with true disease

Question 9

What is the calculation for specificity?

Answer 9

percent proportion of subjects that tested negative among individuals without the disease