Understanding Risk Ratio Calculation
The Risk Ratio (RR), also known as the Relative Risk, measures how much the risk of an event (like a disease) is increased or decreased in an exposed group compared to a non-exposed group.
Risk Ratio Definition
It is calculated as the ratio of the incidence of the disease in the exposed group to the incidence of the disease in the non-exposed group.
- Incidence in Exposed (Ie): The proportion or rate of new disease cases among individuals who were exposed to a potential risk factor.
- Incidence in Non-Exposed (Ine): The proportion or rate of new disease cases among individuals who were not exposed to the risk factor.
Risk Ratio Formula
The formula is represented using LaTeX as:
$ \text{Risk Ratio (RR)} = \frac{I_e}{I_{ne}} $
Why Other Options Are Incorrect
- Option 2 is incorrect because it represents the inverse of the Risk Ratio.
- Option 3 describes the Risk Difference (RD) or Absolute Risk Reduction, calculated as $ \text{RD} = I_e - I_{ne} $.
- Option 4 describes the Odds Ratio (OR), which is the ratio of odds, not incidence rates.
Therefore, the ratio of the incidence of the disease among exposed and the incidence among non-exposed correctly represents the Risk Ratio.
Important Questions from Statistics
The mean and variance of five observations are 14 and 13.2 respectively. Three of the five observations are 11, 16 and 20. What are the other two observations ?
A die is thrown 10 times and obtained the following outputs :
1, 2, 1, 1, 2, 1, 4, 6, 5, 4
What will be the mode of data so obtained ?
Consider the following frequency distribution :
x 1 2 3 5 f 4 6 9 7 What is the value of median of the distribution ?
For data -1, 1, 4, 3, 8, 12, 17, 19, 9, 11; if M is the median of first 5 observations and N is the median of last five observations, then what is the value of 4M - N ?
Let P, Q, R represent mean, median and mode. If for some distribution \(5 P=4 Q=\frac{R}{2}\) then what is \(\frac{P+Q}{2 P+0.7 R}\) equal to ?
