[R] A warning message in glht

[Yuliia Aloshycheva]

Dear all,

I was wondering if you could give me any suggestions/help on the following
issue. So I carried out the analysis of my data using generalized linear
model (glm). After that, to check for multiple comparisons, I applied the
glht function from the multcomp package in R. The output, however, gave me a
warning (please see below). So my question is whether this warning is smth
that I should ignore or not. And if not, what I should do about it (I kind
of know how to deal with this problem for categorical factors, however, in
my data, one of the factors (AveScore) is continuous).

Thanks a lot!

           Yuliia

   Simultaneous Tests for General Linear Hypotheses

Multiple Comparisons of Means: Tukey Contrasts

Fit: glm(formula = EW1 ~ AveScore + Speaker + File + factor(Bplace) + 
    factor(Sex) + AveScore:File, family = binomial(link = "logit"), 
    data = data.0)

Linear Hypotheses:
            Estimate Std. Error z value Pr(>|z|)    
In - A == 0  -0.9055     0.3573  -2.534   0.0302 *  
O - A == 0   -2.5638     0.3917  -6.545   <0.001 ***
O - In == 0  -1.6584     0.3766  -4.404   <0.001 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 
(Adjusted p values reported -- single-step method)

*Warning message: In mcp2matrix(model, linfct = linfct) :  covariate
interactions found -- default contrast might be inappropriate*





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