Statistics

Question 1

What is sensitivity?

Answer 1

Ability to identify those with true disease; = true pos/(true pos + false neg)

Question 2

What is specificity?

Answer 2

Ability to identify those without disease; = true neg/(true neg + false pos)

Question 3

What is positive predictive value?

Answer 3

The likelihood patient has disease with a positive result; = true pos/(true pos + false pos)

Question 4

What is negative predictive value?

Answer 4

The likelihood that patient does not have disease with a negative result; = true neg/(true neg + false neg)

Question 5

What is accuracy?

Answer 5

correct tests/all tests = (TP + TN)/(TP + FP + TN + FN)

Question 6

What is prevalence?

Answer 6

A measure of how common a disease is for a certain time period in the population; = total positive/total population