What is it about?
It has been claimed incorrectly that simple analysis of change scores, unlike ANCOVA, is unbiased where baselines differ. I show that this is not correct.
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Why is it important?
It investigates Lord's paradox and shows that those who claim that simple analysis of change scores is unbiased when baselines differ have smuggled the conclusion into their premises. Simple counter-examples are given.
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This page is a summary of: Change from baseline and analysis of covariance revisited, Statistics in Medicine, August 2006, Wiley,
DOI: 10.1002/sim.2682.
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