Dear Help-list, I have solved the problem by simply deleting the erroneous "0" 
in the "CR core - CR EC" contrast and deleting the unnecessary command 
"test=adjusted(summarytype = "single-step")".   Regards,B. Jessop
 > From: deel...@hotmail.com
> To: r-help@r-project.org
> Date: Sun, 17 Jul 2011 21:04:51 -0300
> Subject: [R] Multiple comparison test on selected contrasts
> 
> 
> 
> 
> 
> Dear Help-list, How can I do a multiple comparison test (mct) on selected 
> contrasts from a linear model while using packages lme4 and multcomp?  I am 
> running R 2.13.0 under Windows 7.  The following linear model and mct 
> produces a global mct of 15 paired contrasts of the combined (Site, Position) 
> factor SitePos of which only 9 are of interest.  Model.G = lmer(log10(SrCa) ~ 
> SitePos + (1 | Eel), data = Data1)
> Model.G.mct = glht(Model.G, linfct = mcp(SitePos = "Tukey"))summary 
> (Model.G.mct)  The following code creates the desired reduced set of 
> contrasts but I have been unable to apply it correctly to the mct.   contr = 
> rbind("CR core - MH core" = c(1,0,0,-1,0,0),"CR core - CR edge" = 
> c(1,0,-1,0,0,0),
> "CR core - CR EC" = c(1,-1,0,0,0,0,0),"CR edge - MH edge" = c(0,0,1,0,0,-1),
> "CR edge - CR EC" = c(0,-1,1,0,0,0),"CR EC - MH EC" = c(0,1,0,0,-1,0),
> "MH core - MH edge" = c(0,0,0,1,0,-1),"MH core - MH EC" = c(0,0,0,1,-1,0),
> "MH edge - MH EC" = c(0,0,0,0,-1,1)) Execution of this code produces the 
> error message: In rbind ('CR core - MH core" = c(1,0,0,-1,0,0), etc.: number 
> of columns of results is not a multiple of vector length (arg 1)'.  
> Model.G.mct2 = glht(Model.G, linfct = mcp(SitePos = contr))  #execution 
> produces "Error in linfct{[nm]} %*% c: non-comformable argument", as a 
> consequence of the previous error
> summary (Model.G.mct2, test = adjusted(summarytype = "single-step")) Clearly, 
> this approach is incorrect (and I have tried others).  How can I introduce 
> the selected set of contrasts into the mct?  Thanks for any help provided.  
> Regards,B. Jessop                                          
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> 
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