OLS preparation · Bridge
The Two-Group t-Test as Regression
A binary indicator in an ordinary least-squares model estimates a difference in means.
Page 1 of 7 · Big Picture
The big picture: The Two-Group t-Test as Regression
How can a two-group mean difference be written as a model?
Why a policy analyst should care
Seeing a two-group mean comparison as regression reveals that familiar tests and models estimate the same contrast and prepares the way for principled adjustment.
Follow the idea from the opening question to a practical decision. These are the conceptual moves this module will develop:
1 Question How can a two-group mean difference be written as a model?
2 Explore Change the reference group
3 Formalize An indicator coefficient is a mean difference
4 Transfer Audit a regression encoding
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