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ANOVA and TUKEY contradiction

Discussion of the distribution and abundance of living organisms and how these properties are affected by interactions between the organisms and their environment

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ANOVA and TUKEY contradiction

Postby ColinD » Tue Apr 26, 2011 6:09 pm

Hi,
I'm struggling a bit with ANOVA at the moment, can anybody help me? I'm using two way ANOVA, which confirms that there is a significant difference in the data I am comparing. I am then using Tukey test to determine which of my means are significantly different. However, Tukey is telling me that none of the means are significantly different. Is this posssible?

Thanks for any help

CD
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Postby Babybel56 » Tue Apr 26, 2011 10:43 pm

Are you sure that all of the parameters for parametric testing have been met? Differences in normality and standard deviations can lead to contradictions.
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Re: ANOVA and TUKEY contradiction

Postby ColinD » Wed Apr 27, 2011 12:57 pm

Hi thanks for the advice. I think I've realised what the problem is, though I can't check it at the moment because I don't have the data in front of me. I think that P>0.05 for my samples, so therefore I'm wrong, ANOVA is not showing a significant difference. I'll check later, but I bet that's what I've overlooked.

Thanks a lot

CD
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