Data Source and Methodology
All calculations are strictly based on the standard statistical formulas for relative risk. For further reading, see MedCalc. All calculations are rigorously based on the formulas and data provided by this source.
The Formula Explained
Relative Risk (RR): RR = \frac{[A/(A+B)]}{[C/(C+D)]}
Glossary of Terms
- A: Number of events in Group A.
- B: Total number in Group A minus A.
- C: Number of events in Group B.
- D: Total number in Group B minus C.
- Relative Risk (RR): A measure of the strength of association between exposure and outcome.
How It Works: A Step-by-Step Example
Suppose you have a study where 20 out of 100 individuals in Group A experienced an event, while 10 out of 100 individuals in Group B experienced the same event. The relative risk can be calculated to determine if Group A has a higher risk of experiencing the event compared to Group B.
Frequently Asked Questions (FAQ)
What is Relative Risk?
Relative risk, also known as risk ratio, is a measure used in statistics to determine the strength of the association between exposure and outcome.
How do I interpret Relative Risk?
A relative risk of 1 implies no difference in risk between the two groups. A relative risk greater than 1 suggests a higher risk in Group A compared to Group B.
Can Relative Risk be less than 1?
Yes, a relative risk less than 1 indicates a lower risk in Group A compared to Group B.
Why is Relative Risk important?
Relative risk helps in understanding the effect of a particular exposure on an outcome, which is crucial in fields like epidemiology and public health.