Good idea, Luke

I wasn't tagged but I felt like doing this. (Ditto)

Instructions:
1. Grab the nearest book

2. Open the book to page 123

3. Find the fifth sentence.

4. Post the text of the next 3 sentences on your blog along with these instructions

5. Don't you dare dig for that "cool" or "intellectual" book in your closet! I know you were thinking about it! Just pick up whatever is closest.

6. Tag three people.

The appropriate measure of association depends on the study design and its corresponding measure of disease frequency.
From Veterinary Epidemiologic Research by Dohoo et. al.