I am trying to perform a partial CCA in CANOCO 4.5. When chosing some groups of variables as variables and the rest of the environmental variables as covariables to calculate the net effect of the group, I get the error message "No explanatory variables remained" and the analysis fails. The variables in the groups could be numerical or dummy coded categorical, it happens in either case. When regrouping the respective group to another, it does increase the effect of the other group, so there should be some explanatory power! I already checked for linear combinations. All variables concerned were significant in forward selection. Does anybody have an idea what could be wrong with the data?
Hi Sarah,
Sorry, when you say "When chosing some groups of variables as variables", do you mean your response variables or your environmental variables?
I meant environmental variables, but actually I already got some help, it was caused by linear dependences between some of the environmental variables. Thank you for answering!
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