Anyone has applied Johnson-Neyman procedure by using r?

11 November 2019 1 6K Report

I run an ANCOVA, finding a significant interaction between my treatmente and a covariate. Now I would like to identify the regions of significance in order to state for which values of the covariate my slopes are different. I've triyed "js" function of "probemod" package, but I have some problems. Maybe somebody knows how to solve this, or other methods.

Thank you.

David Eugene Booth

See D. C. Montgomery, Design of Experiments under interaction plots. Then see this book: https://www.amazon.com/Analysis-Experiments-Chapman-Statistical-Science-ebook/dp/B00UVBRX2G/ref=sr_1_1?keywords=lawson+design+of+experiments+R&qid=1573618167&s=books&sr=1-1

It describes an R package that does all of this. Hope this helps, D. Booth

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