Hello,
If you are using the group column in the GLM to set up a design.grp
file for use with the -e option in randomise, you can safely ignore
this message.
Many Regards
Matthew
> Thank you for your response, it is very re-assuring.
>
> With regards to the error messages you said:
>
>>It is probably because you've run exactly the model above that is
>>indeed rank deficient. You just need to add some subjects (and
>>presumably you've got more than one control) as some additional EVs and
>>it should not be a problem anymore...
>
> Actually, I have run this model in Glm using 24 controls, 15 abstinent
> subjects, and 5 relapsers. That is when the error message appears. So,
> adding the EVs in the same way I did with the example dataset does not
> seem to resolve this error message. Do you have other thoughts about
> why this could be happening?
>
> Thank you so much.
> Omar
>
>
>
>
>> Problem with processing the model. Warning: at least one EV is (close
>> to) a linear combination of the others. You probably need to alter
>> your design. (Design matrix is rank deficient - ratio of min:max
>> eigenvalues in SVD of matrix is 1.21792e-17).
>>
>> Warning-design matrix uses different groups (for different variances),
>> but these do not contain "separable" Evs for the different groups (it
>> is necessary that, for each EV, only one of the groups has non-zero
>> values).
>
> Hope this helps,
> Gwenaelle
>
>
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