Qualitative analysis of the ANOVA residuals [General Sta­tis­tics]

posted by Helmut Homepage – Vienna, Austria, 2014-02-19 15:22  – Posting: # 12450
Views: 12,354

Hi Lucas,

» We've been asked to perform a qualitative analysis of the residuals of the ANOVA.

ANVISA?

» Now, I don't know what that analysis is supposed to acomplish, so I don't know what is supposed to be done.

IMHO, assessing the studentized residuals makes sense. See also Canada’s Guidance, Section 2.3.4.
  1. From the model’s raw residuals calculate the standardized residuals (aka internally studentized residuals).
  2. From them calculate the studentized residual (aka deleted studentized residual, extrenally studentized residual).
Both are directly accessible in SAS and R – and with a little bit of struggle – in Phoenix/WinNonlin. I would suggest to come up with a box-plot (optionally overlayed with jittered values) and ±3 as an optical reference. Looks like this:

[image]

Cheers,
Helmut Schütz
[image]

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