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Hi all, I'd like to compare species richness patterns of two groups with paired observations with an extra continuous fixed effect as a covariate. Normally I would use a standard general mixed effect model for such data, with one group variable and a continuous variable as fixed effects, plus a random effect for the paired observations. However, after making such a model with the lme

...l Length",ylab="Residual Hand Strength (Broad Dowel)", main="Males") abline(reg1,lty=1) abline(reg2,lty=2) abline(reg3,lty=3) abline(reg4,lty=4) abline(reg5,lty=6) -- *Jessica da Silva* PhD Candidate Molecular Ecology & Evolution Program Applied Biodiversity Research Kirstenbosch Research Centre South African National Biodiversity Institute Postal address: 3 Sangster Road Howick, KZN 3290 Home/Fax: +27 33 330 2230 Cell: +27 79 045 1781 Email: jessica.m.dasilva@gmail.com j.dasilva@sanbi.org.za Website: http://jmdasilva.doodlekit.com/home/home [[alternative HT...