Precision Vs Accuracy

Question 1

Accuracy

Answer 1

The trueness of test measurements (validity)
The absence of SYSTEMIC ERROR or BIAS in a test
(How close is the measured value to the true value)

Question 2

Systemic error - accuracy

Answer 2

Systemic error decreases accuracy in a test

Question 3

Presicion

Answer 3

-the consistency and reproducibility of a test (reliability)
-the absence of random variation on a test
(How close the values are each to other)

Question 4

Precision - standard deviation

Answer 4

Increased precision –> decreased standard deviation

Question 5

Precision - statistical power

Answer 5

Increased precision –> increased statistical power (1-β)

Question 6

random variation - precision

Answer 6

Random variation decreases precision of a test

Question 7

Standard deviation?

Answer 7

how much variability exists from the mean in a set of values

Question 8

interrated vs test-retest precision

Answer 8

1. interrated –> similar results when the test is administrated by a different rater or examiner
2. Test-retest –> similar results when the sybect is tested as a second or third time

Question 9

Clinical probability?

Answer 9

is the number of times an event occurs divided by the number of times that the event can occur

Question 10

attack rate?

Answer 10

is a type of incidence used to describe disease outbreaks