1. Refer
to the data in Table 1. The data are in a .csv file
on Blackboard. Enter the data into R and consider the following:
a. What is
the Risk of dying from West Nile Virus when the syndrome was unknown?
b. What is
the Risk of dying from West Nile Virus when the syndrome was WNND?
c. What is
the Relative Risk?
d. What
can you say about the Relative Risk in this example?
2. Again, refer to the data in Table 1.
a. What is
the odds ratio of dying from West Nile Virus when the syndrome was unknown
compared to when the syndrome was WNND?
b. What is the odds ratio of dying from West Nile Virus when the
syndrome was WNND compared to when the syndrome was unknown?
c. Is the
Odds ratio significant?
d. What
can you say about the odds of dying from West Nile Virus in this example?
3. R
calculated the ratio (for risk and odds) confidence intervals for you. How
would you do it by hand? Hint:
remember our discussion about the log of the odds and taking the exponent
(which is the opposite of a log). Note: calculate
away if you would like to illustrate your point or check your work, but I am
looking for a few sentences describing the process.
Table
1: West Nile Virus

Death 

Syndrome 
Yes 
No 
Unknown 
8 
83 
WNND* 
15 
194 
* West Nile Virus Neuroinvasive Disease