For some reasion I wasn't able to use TukeyHSD - I think because I need to
set the different levels under a second variable.
Tukey only helps me when I have more than 2 levels of same variable.
Thanl you.
On Sun, Dec 20, 2009 at 6:32 PM, S Devriese <sdmaill...@gmail.com> wrote:
> On 12/20/2009 04:56 PM, Or Duek wrote:
> > I don't have missing data.
> > about what I need.
> > Lets say the drug*strain interaction is significant - now I want to check
> > for drug under the levels of strain - compare drug 1 and 2 only on strain
> 1
> > and then only on strain 2.
> > Or I'd like to compare the strains under levels of exposure.
> > This is the kind of data I fail to see in summary() but it is important
> to
> > understand the interactions.
> > thank you.
> >
>
> Do you main pairwise multiple comparison tests like Tukey Honest
> Significant Difference tests? Then you could use TukeyHSD in the stats
> package or see the DTK package (Dunnett-Tukey-Kramer Pairwise Multiple
> Comparison Test Adjusted for Unequal Variances and Unequal Sample Sizes)
>
> Stephan
>
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