Hi - there's no set rule that says you need 14 - it's just the case
that as numbers get much smaller than that it's hard to get
significant results because of the low degrees of freedom and
corresponding high estimated uncertainties.
If you only have 6 subjects and want to make generalisable statements
about the population, you still have to use mixed-effects modelling!
Cheers.
On 18 Feb 2009, at 12:44, Yael Shani wrote:
> Hi
> I am currently analyzing 6 subjects. I know that Mixed effect
> requires at least 14 subjects.
> Thus, if I want to do a multi subject analysis, can I do it using
> Fixed effect?
> Thank you
> Yael
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Stephen M. Smith, Professor of Biomedical Engineering
Associate Director, Oxford University FMRIB Centre
FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
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