Cook’s distance [Outliers]

posted by Helmut Homepage – Vienna, Austria, 2013-02-21 18:44 (3757 d 01:09 ago) – Posting: # 10095
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Hi Karthik,

❝ by using the prog reg and gplot (subject vs dffits) I plot the graph for cook distance method, whether its correct.

I don’t know this software. Looks like you have included both treatment periods from a 2×2×2 cross over study. Residuals from both periods should have the same values and differ in their signs. Rerun the analysis with one period only. Here is an example obtained with R, package bear:

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