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2008 Feb 20
1
p-value for fixed effect in generalized linear mixed model
...t; has a highly significant effect on "aphids". However, when I look at the summary of model1:
summary(model1)
I find a t-value for "spikes" of -0.1166 which is really insignificant...
When I try model1 in SAS with proc glimmix, corrected for overdispersion with "random _residual_", it also gives a p-value for "spikes" of 0,985. So if "spikes" is not having a significant effect on "aphids", then why the above mentionned p-value generated by anova in R?
Can anyone explain this?
Please find the dataset in the attachment.
Many thanks befor...