PPT Slide
Analysis 101: Basics of experimental design
1) Before and after trial
- physiological parameter/outcome measured
- intervention delivered
- physiological parameter/outcome measured again
- compare measurement before with measurement after, usually in same subject
2) Comparison between two groups
- subjects are randomly assigned to one of two groups
- one group receives intervention
- compare outcome between two groups after intervention
3) Comparison between more than two groups
- as above but subjects are assigned to more than two groups
- could compare 3 different drugs or 3 different doses