[R] help with contrasts for a binomial 3-way GLM

2008-10-31 Thread Susana Zuloaga
Hi I am a new user the R and I am very grateful for all your help but... I have a problem and I can't resolve yet. I am trying to get the contrasts for a binomial 3-way GLM (T= 4 temperature, t= 2 time and c= 2 substrate levels, plus treatment control) in total they are 17 treatments.

[R] problem with "simtest"

2008-10-29 Thread Susana Zuloaga
Hello all I am working with the package multcomp but I have problems with the function simtest; the program say that can not find this function, nevertheless I doesn't have any problem with the function glht that it is in the same package. Someone knows what could be the problem? Thank you

[R] Fw: It 's correct to do contrasts for a GLM?

2008-10-23 Thread Susana Zuloaga
Hi all I am one recent user of R and have a few doubts I did a binomial GLM with 3 - factor and now I have to test contrasts to identify that treatments are different. I know that the contrasts are used in ANOVA, it is not incorrect to use them in GLM? there is a way to do contrasts between

[R] help wiht contrasts for GLM

2008-10-22 Thread Susana Zuloaga
Hi I conducted a binomial GLM (with 3-factor) but I need to make a contrasts test between the averages of the treatments; I need know what treatment are equal. I know that the contrasts are used only in ANOVA I suppose that is incorrect doing this in a glm, there is some way to make contrasts m