search for: coversessileinvertebrates

Dear R, I have a question concerning quantile regression models. I am using the quantile regression model to test the relationship between abalone and the percentage cover of algae etc at different sites and depths. An example is fit<-rq(abalone~%coversessileinvertebrates+factor(Depth)+factor(Site),tau=0.7) In this model depth is fixed and site is random. My question is, is it possible specify the fixed and random effects in this model. If so could someone please give me an example of how to write the code. I can;t seem to find any information in the R help. Thank...