I would gladly apply pretesting [General Sta­tis­tics]

posted by ElMaestro  – Denmark, 2015-02-24 15:28 (3787 d 09:55 ago) – Posting: # 14500
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Hi all,

I would gladly apply pretesting.

It will only lead to inflation of type I errors if the alpha for both the pretest and the BE is brainlessly chosen to be 5%. Adjust them, and you're good to go in terms of the type I error.

You will find wording in the guideline to the effect of not assuming variance homogeneity. It can along these lines be argued that you are not assuming it when you are testing for it and letting the outcome decide your next step.

All is good.

Choice of actual alpha's is of course a little tricky but that is a mere practicality.

LMSTFY. :-D

Pass or fail!
ElMaestro

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