[R] Please Post Planned Contrasts Example in lme {nlme}

[Liviu Andronic]

On 3/18/10, Martin Turcotte <mart.turcotte at gmail.com> wrote:
> Hi I am running some linear and non-linear mixed effect models and would like to do some planned contrasts (a priori contrasts)
>
>  I have looked in the help and in many forums and it seems possible to do so but don't understand how to write the function and I couldn't find an example in Pinheiro and Bates.
>
Did you try John Fox' appendix on mixed effects models [1]?
Liviu

[1] http://socserv.socsci.mcmaster.ca/jfox/Books/Companion/appendix.html