Hi,

I am carrying out a stable isotope study, where I have measured stable
isotopes of nitrogen and carbon in plants at different sites.  I have been
able to create mixed models for each isotope separately - eg

fit1.c<-lme(X13c~soil+manure, random=~1|site, weights=varIdent(form = ~ 1 |
soil), data)
fit1.n<-lme(X15n~soil+manure, random=~1|site, weights=varIdent(form = ~ 1 |
soil), data)

What I'm wondering is if I can test both stable isotopes at the same time,
in a MANOVA style analysis.  I can't seem to find any info on this - if
someone could point me in the direction of some info, or tell me if this
isn't possible , I'd much appreciate it.

Thanks, Sarah Adams

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