Relationships · Categorical data
Effect Magnitude Before Significance
What is the size of the difference, on a scale a policy audience can understand?
Page 1 of 7 · Big Picture
The big picture: Effect Magnitude Before Significance
How large is the difference in proportions?
Why a policy analyst should care
Policy decisions depend on how large a difference is, not merely whether a large sample can detect it.
Follow the idea from the opening question to a practical decision. These are the conceptual moves this module will develop:
1 Question How large is the difference?
2 Explore One comparison on three scales
3 Formalize Risk difference, risk ratio, and odds ratio
4 Transfer Interpret a national change
Use the left and right arrow keys to move between pages.