Proc nlmixed - are you using SAS? 

I don't use SAS, but I am currently doing running ANOVA test on nested models in R, another statistical software that is publicly free to use. If you plan on using R, here's a few helpful websites that can help I used for coding in R:

a) http://www.ohio.edu/plantbio/staff/mccarthy/quantmet/lectures/ANOVA-III.pdf

b)  http://conjugateprior.org/2013/01/formulae-in-r-anova/

I know these are in R, but if you plan on using R to do the nested linear models, then, the above links are helpful to use. 

Hope this helps!

Amanda

Hi, 

Littell gives an example in his book. 

See also http://www.sas.com/offices/NA/canada/downloads/presentations/Suave-Nov11/nlmixed-crossed-nested-suave2011.sas

But this is actually for quite simple models. If you know a way to use it on more complicated models too (more levels) , let me know :-) 

Cheers, Koenraad