Campbell-Style Designs
Post-Only Comparisons
When no pre-period is available, the comparison depends heavily on measured covariates and an explicit balancing strategy.
Page 1 of 7 · Big Picture
The big picture: Post-Only Comparisons
Can weighting make post-treatment groups comparable without a pre-period?
Why a policy analyst should care
Without baseline outcomes, causal credibility rests heavily on whether observed adjustment can make groups comparable and whether important differences remain unmeasured.
Follow the idea from the opening question to a practical decision. These are the conceptual moves this module will develop:
1 Question Can a post-only comparison support a causal claim?
2 Explore Balance and weighting construct the comparison
3 Formalize Reweight observed covariates
4 Transfer Defend a weighted post-only study
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