Sample size estimation for randomised controlled trials with repeated assessment of patient-reported outcomes: what correlation between baseline and follow-up outcomes should we assume?

Overview of attention for article published in Trials, September 2019

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ANCOVA controlling baseline in RCT - power analysis and sample size questions

Posted by LJN, at stats.stackexchange.com, 20 Feb 2021

I am performing a power analysis/sample size estimation for an RCT. We will be controlling for baseline symptoms and using post-t…

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