Statistics
The three Rs
Question: is there a relationship between two variables? Is it a causal relationship?
1. Explanation: description, prediction, causation
2. Gold standard: randomized comparative experiment
3. Simple case: completely randomized experiment
4. The three Rs:
(a) Randomize
(b) Replicate
(c) Block (special case: matched pairs)
Homework
1. Read Sections 6.3, 6.4
2. Dog problem (on reverse)
April 20, 2009