PPT Slide
Analysis 101: Dichotomous outcomes
1) Before and after trial
- rate before intervention compared to rate after intervention
- McNemer’s chi-square
2) Comparison between two groups
- create 2x2 table, calculate rate for each Group
Dead Alive
Group A 2 8 20% mortality
Group B 7 3 70% mortality
- compare using chi-square test
NB - if any one cell contains < 5 counts, use Fisher’s Exact test