Terms Flashcards
Prevalence
Proportion of population with a condition.
Number of people with condition/studied population
Incidence
Measure of risk of developing a condition.
New cases/population at risk
Sensitivity
% of people with disease who have a pos. test
True positive
_______________________
True positive + false negative
Specificity
% of people without disease who test negative
True negative
___________________
False Positive + True negative
Positive predictive value
% of people with a positive test, who have the disease
True Positive
_____________________
True positive + False positive
Negative predictive value
% of people with negative test that do not have the disease
True negative
_____________________
True negative + false negative
Independent variable
Inputs or cause. What you change.
Dependent variable
Output or effect. Does this change as a result of independent variable.
Risk
Risk of disease in one group in relation to another.
Risk of disease in exposed
______________________
Risk of disease in unexposed
Odds ratio
Odds of exposure in a case group, vs control group. Measure of risk
Odds of exposure in case
____________________
Odds of exposure in control
Type-I Error
Say there is a difference, but there isn’t
Rejet the null hypothesis when it is correct.
Type-II Error
There is a difference, but say there isn’t.
Incorrect failure to reject a null hypothesis
Nominal variable
Variable with no numerical value (Ex: gender)
