Dear list members.

I've been trying to apply GLM for spatial analysis of  a marine animal's
distribution (as the dependant variable) related to many environmental
variables (as the independant ones). But some of them are correlated, for
example, the depth increases as the distance to coast increases, and  I
must test both. Does it disagree with the assumption of independence of the
data? If yes, how can I fix it in order to keep the two variables in the
model?

I have other doubt: is it possible to use uncountable variables (e.g.
categorical) as independant variables with other countable ones in the same
formula? If yes, how should I do that?

Thank you so much.

Suzana

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