Hello,

How do I run interaction between to categoric variables in lme()?

I tried this:

> lmefit1<- lme(Handling ~Mass+factor(Prey)+factor (Decap)+
factor(Prey)*factor(Decap), random = ~ 1 |Place, data=nestling1)

Error in MEEM(object, conLin, control$niterEM) :
Singularity in backsolve at level 0, block 1


Regards Kes,

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