[R-sig-eco] Understanding the output from lme anova

[Hedberg Peter]

Dear all.

I have a question regarding how to interpret the output from my lme.anova.

My model looks like this

lme_Cyperaceae<-lme(Cyperaceae~Site+Ditch_block+Tree_cut+as.factor(Dist_start)+((as.factor(Dist_start))*Tree_cut)+((as.factor(Dist_ditch))/Ditch_block),random=~1|Mainplot/Transect/Obsplot)

My question concerns that I use the divission sign to indicate nesting in ((as.factor(Dist_ditch))/Ditch_block), and I use * to indicate two-way interaction in ((as.factor(Dist_start))*Tree_cut), but in the output both terms are presented
with a colon (:) sign.

Tree_cut:as.factor(Dist_start)        3     6  0.259899  0.8520
Ditch_block:as.factor(Dist_ditch)     4    56  2.695738  0.0399

Is there something wrong in how I wrote the model, or is the colon sign  used for all interactions weather nested or the * type.

Would be greatly thankful for any help in understanding this.

The output mentioned above is from an analysis of lme.anova on the result of the lme model.

Best regards,

Petter Hedberg



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